I find the question rather impossible to answer because I'd have to ask myself what style, and often, I prefer soul/feeling over technical skills, and some guitarists are just brilliant in their niches, but not in others.
I'm extremely fond of Reine Fiske's (Morte Macabre, Landberk, early Paatos, Dungen, etc) guitaring since what he does it just tugs at my core. Makes me want to cry at times. And I'm also fond of Robin Guthrie's (Cocteau Twins) eerie dreamy tones. In metal, I love Fredrik Thordendal best, probably. Prog...oh...that answer might take a lot of thinking, since there's a lot to think about hahahaha! Shredders...probably Buckethead, although I'm not fond of shredding for the sake of it...I actually prefer Buckethead when he's being atmospheric, like in Death Cube K, for example.