I don't like Martin strings.
I use D'Addorio almost exclusively, though I've been trying some others lately. I do use Elixir nano strings sometimes and right now I have Peavey strings on because I bought them for $3 out of a cheap bin. I'll probably try some of those rare earth or whatevers, and maybe some Ernie Ball strings as all the bluegrass guys seem to dig those. Anyway. I try all sorts of strings and change them about every four to six weeks. I switch up brands, materials, and sizes.
My Yamaha sounds best with D'Addario Silk and Steel .011's, but they go dead from the oils on my hands in about two weeks and take two or three days to settle in. So I don't get much play out of them. Elixir nanoweb .012s are the second best sound for that guitar. They last a loooooot longer, so despite being more than twice the price are a better value for me. I can get two months or more out of those strings on that guitar.
I'm still messing around with my Guild to see what sound I like best. So far, the phospher bronze is leading the pack. The el cheapo Peavey strings actually sound pretty good. These are .012s. I've found that the Guild likes .012s and .013s, but my Yamaha likes .011s and .012s. Must have to do with what Guitarpix said. My Yamaha came strung with .010s and it sounded like trash. But I've lowered the bridge and had a truss rod adjustment to take the .012s.
There's some rambling thoughts.
Short story of it: Strings are cheap. Try a bunch. If you use a pick, try different picks too. I was amazed at how much difference a pick makes to tone.
- Zurf
Granted B chord amnesty by King of the Mutants (Long live the king).
If it comes from the heart and you add a few beers... it'll be awesome! - Mekidsmom
When in doubt ... hats. - B.G. Dude