I've only seen three episodes of Enterprise and I hated one of them, but it's still the series I'd most want to see brought back based on those choices. I haven't seen all of DS9 yet, but from what I've heard, it tied up all of its loose ends nicely in its season finale, and so did Voyager. Okay, it sounds like DS9 does have this lingering thread of Sisko's fate, but I don't mind it being left as it is. Could be worse. I've only seen a few Voyager episodes and thought they were all either terrible or mediocre, so there's no way I'd want to see that brought back.
I absolutely ADORE "In A Mirror, Darkly", and I imagine that if Enterprise was brought back, there would be a lot of great stories like that one which are fresh and new, while also exciting as ways to further establish backstory for the previous Star Trek shows, making the show enjoyable both for fans of past Star Trek shows as well as the new series as a standalone. I've read all kinds of trivia about proposed fifth season ideas like the origin of Guinan and the Borg Queen being created from a female scientist (played by the actress who played the Queen) and they sound more fun and intriguing than anything I could see a resurrected DS9 or Voyager come up with.
The other series seemed to run out of steam as they were winding down, but Enterprise by all accounts (and if "In a Mirror, Darkly" exemplifies its pre-cancellation status) was just starting to turn itself around for the better when it got canned. It's a shame the series apparently took so long to find its footing, if it had been as good from the start as people say it was at the end, maybe it might even be more highly regarded today than Voyager was, rather than the black sheep of the Star Trek franchise.