There is no "best" IMHO. Some guitars cut it in open tunings and some don't and it's not necessarily related to make. Same with standard tuning. Same with other instruments, e.g. OMs, citterns and 'zouks. You just have to try them all until you find the one that works for you. I use "unfashionable" makes in the main but they work for what I need!

Concerning rhyzla's question above, I've noticed over many years that tops can become "accustomed" to a particular key. I know a lot of luthiers tap tune their materials to resonate with particular keys but can't explain the physics behind the "accustomization" (I'm only a mere biologist!). Maybe a resident physicist could chip in at this point....?

Peace

moo