If your preferred universe is not listed, please mention it in comments, but please vote for whichever of the listed choices would be suit you.

Futurama, anyone? Lots of strange surprises, always something new and interesting to do, and just an all-around good time.

Also, Stargate would be wonderful, just because of all the discovery and science and archaeology involved. I was a huge fan of the movie, rather than the series, and so I would probably want to be in the earlier part of the timeline and be one of the people doing research into the history and origins of the stargates. And probably a little travel, just for kicks.

I would like the Dr Who Universe, but it's so much like this one... and it has those awful angels in it. Though, I think the actuality of getting attacked by one of them is far less scary than the nightmares I've had (remember, they DON'T ACTUALLY KILL YOU -- except as far as your family and friends are concerned).

I'd forgotten about the replicator. It would sure be nice to have one of those. However, I think of it as being a little -too- sci-fi. As in, based on my limited knowledge of the laws of physics, I probably wouldn't believe it was possible or real even if I lived in that universe, and that could make it a little hard for me to use the thing.

Also there's a lot of war and strife between the spacefaring races in Star Trek. I didn't get far enough into the Stargate series(es) to get to the war and strife parts that I am sure are there, so my perception of the Star Trek world is that it's much more warlike and dark... even though I'm sure that perception is skewed.

If I had my pick, I'd live in Larry Niven's Known Space universe. Boosterspice, nanotech body repair, cool aliens (mostly peaceful), cheap teleportation, space travel at three days to the light year. Get to hang out on worlds like Down, home of the Grogs, sessile furry cones with a disturbing substitute for hands; Jinx, home of the Frumious Bandersnatchi, giant, intelligent amoebae; and that's leaving out the Ringworld, a massive, seemingly-impossible structure filled with mostly friendly hominid life in literally millions of species.

There are a few Arthur C. Clarke stories I wouldn't mind living in, either. Songs of Distant Earth had an amazing, pretty utopian world, with mostly mild conflicts and wonderful, fascinating people.

There are also sci-fi worlds I would probably visit if I was having a bad day, but would never want to get stuck in. Like any Philip K. Dick novel.

There actually aren't that many fictional universes that I would like to live in. The planet Sphinx in Weber's Honoverse sounds awesome, and outside the Cetagandan Empire and Jackson's Whole the Vorkosiverse sounds like an interesting and not too awful place.

I figure a follow on poll is is gonna have to be literature fictional science fiction universes.  That's almost a massive enough topic we'd have to do a double elimination tournament to put em all in.  (I'd be half tempted to seed Twilight against Handmaid's Tale, in a misogyny off)

If I had my pick, I'd live in Larry Niven's Known Space universe.

I was actually thinking about the known space universe, but I figured I'd be the only one I knew what I was talking about--I'm glad to be wrong.

The Culture. No question about it at all.

Voted Trek as nearest equivalent; the Federation is well on its way to the Culture's post-scarcity society with its economy based on replicator-driven socialism. I don't like their attitude to their AIs, though. The Measure of a Man precedent rightly recognised Data as a person, and the defence argued that were he reverse-engineered and mass-produced then the great horde of Datas would constitute a race, and their use by Starfleet therefore slavery. Yet this is completely ignored only a decade or so later, when every new starship launched by Starfleet carries backup holographic crew who are expected merely to serve.

I'd like to get my hands on some late-Voyager era Federation hardware and build a real monster of a starship. Warp core, fuel supplies, layer of computronium, all plated with holographic projectors and replicators. The bare minimum implemented in hardware. Everything else? Projected holographically, or if it needs to last when separated from the ship, replicated on demand. So, need to go somewhere? Conjure up warp nacelles, dismiss them once done. In a fight? Your ship is now nothing but armour and shield generators and phaser banks, wrapped around a dedicated power supply. You don't even need life support systems or living quarters unless you've got meatbags on board; the ship is run by an AI or committee of AIs, who exist in the computer and who don't even bother projecting a body unless they need to meet the meat face to face.

The Culture would fucking _love_ that. No doubt the Minds they'd put on board such a thing would surround themselves with life-support habitats most of the time just for the company. But it's not essential, and in wartime it would be left behind. Like how the Enterprise used to be able to separate the saucer section whenever danger threatened and the effects budget allowed, but taken to its ultimate extreme.

Farscape and Babylon 5 have great stories, but I don't actually want to live in that world if I have better options. The imperfections are why the stories are great, of course, but they're also why life there wouldn't actually be any better than life here.

Star Wars would be fun if I won the natal lottery and was born as one of the rulers. Everyone else seems to live pretty much like I do, except their cars hover and their planet might get blown up at any time. Or, alternatively, they're a Jedi and get to be taken from home as a child, rigorously trained and programmed taught, denied any sort of erotic or romantic existence, additionally programmed taught to suppress half their feelings (can you IMAGINE the cadre of therapists the Jedi council must employ?), and at a relatively young age die horribly in combat, probably against a droid or clone that feels nothing over their death. It evens out.

Battlestar Galactica... holy crap, NO. Cool stories as I hear 'em, but I don't want to live in a space refugee camp that's under attack most of the time! Especially since that going home thing is such a problem! You think modern refugee populations are bad enough, but at least they can point at a fuckin' map and say "That's home right there, it would be good to go back".

Star Trek therefore wins. Most people live post-scarcity. Most people have generally happy, fulfilled lives. Most people have homes they aren't worried about losing, don't have to worry about hunger, don't have to worry about disease, poverty, going cold in the winter, paying the credit card bills, paying grandma's medical bills, will eating this give me food poisoning, or even doing the effing dishes.

Most people's biggest worry is: where shall we eat dinner tonight? And does that cute guy/girl two doors down like me?

Instead of having a huge chance of being born a regular struggling schmuck and a really tiny chance of being born as someone who's not got many worries, the numbers are reversed. You have a near-certainty of being born as someone who has what is essentially guaranteed upper-middle class ease and opportunities for personal growth/fulfillment. Then you have a very small chance of becoming what is basically an adventurer - Starfleet or outer colony worlds and such - entirely by your own choice, if you decide you want that. And, finally, you have really very tiny chance of being assimilated by the Borg.

But hey, at least you still won't have to worry about dishes.

Another vote for Banks' Culture.