What acoustic guitar strings do you like and why?

D'Addario EXP16 Coated Phosphor Bronze .012 - .053

For reference, this is on a Taylor 612ce that is played almost exclusively fingerstyle. What I like about them is that they have a rich mellow tone that tames the brightness of a maple guitar with a smaller body. The coated strings last longer and sound better than Elixirs. Also, on 2 out of the last 3 sets of Elixirs I had, the coating on the strings started to fray. Maybe I left them on for too long but that's the whole point of coated strings.

E->G is a pretty long way to go. For some reason I have more trouble with G-strings breaking when re-tuning than any other string. I use a lot of different tunings but I try to do it so that I never have to re-tune the G more than a whole step. In fact, I really don't like to tune it higher at all. There is one song I play that calls for a tuning of C#-A-C#-G#-A-E. I tune that one down a half step to C-Ab-C-G-Ab-Eb so that I don't have to go up from a G to a G#.

John Pearse- Medium Bronze wound 80/20

Love love love them. The more you play them, the better they sound. Round, rich tone with clear highs without the annoying, abrasive, tinny sound that is currently plaguing acoustic players.

elixir

D'Addario EJ19 Phosphor Bronze, 12-56 they are light tops and medium bottoms. Use to use Exlir (both nano and standard) but my fingers don't eat up strings like some people's so didn't see a reason to stay with them. D'Addario 38's on a 12 string.

Those middle bottoms on the cedar top (DY62c) pumps up it's mellow sound with a more rounded richness. And the 19's on the DY57 (D16 clone) makes my Martin friends shake their heads with how quick it jumps out with an even more bottom-end full sound. They really make it jump out - but can be too boomy (even muddy) if over played and not quite as balanced (but I don't beat up or overplay all that often). I like them better than the more popular EJ16's.