I used to play blues and rock, but I got a bit bored, not because I had mastered it or anything (I dont like to think that anybody can ever truly master a style, there's almost always more to learn, ways to improve) but because i thought the idea of having more harmonic choices would be more interesting. Also, I like how jazz is way more loose in terms of performance. There's improvisation not only in solos, but it comping rythm, dynamics, chord voicing choices, and so on.
I'm just saying I don't think there can be a best guitar player because how would you define it. If you go by absolutes (fastest, knows the most chord voicings, knows the most scales) then you can pick best playeres, but there's more to music than that. Who's better, George Benson or Grant Green? Theres no way to answer that question, since there's no way to define better.