Technically it's not a bridge, but I love the design of the Ops on Deep Space Nine
. That's one huge set (at least it appears to be huge).
But I guess my favorite will always be the bridge of the original Enterprise
. I love the colors, the boxy computers and all the little buttons on the black consoles. I'm also fond of the moiré pattern on Spock's scanner and love Sulu's extendable tactical screen. I must also admit that I'm very much attached to the set for very sentimental reasons.
Honorable mentions also go to the bridge of the NX-01, which looks very functional, and the bridge of the Enterprise-D
, because it introduced the wonderfully clean and sleek look of the Okudagrams.