who, in your opinion is, at the moment or in history, the greatest guitar player

my top pic is probably joe satriani or dimebag darrell
Valient Thorr's guitarist...i cant think of his name...
well ok..he's not the greatest
but my favorite of any modern band
They're all different. There are plenty of guitarists that are the best in the world in their own niche. Even in the individual genres (modern rock, ska, blues, shred), there are at least half a dozen guitarists that are equally great in their own ways.