billy sheenan is freakin sick. there's vids of him back in the 80s when he was in david lee roths band with steve vai. n they're havin a fukkin guitar/bass duellll!!! otherwise i'll just stick to anyone who's not too artistic and has to show offfff his so called skills. a beatmachine who really sets a good pumping tempo.
Best, as in most impressive in my opinion would probably be Billy Sheehan. I saw him live a few years ago with Steve Vai's band and together it was a total shred fest.
I agree with Black Harmony with Cliff and Lauri. Pepsi Tate and Rachel Bolan were/are also good players.
Nikki Sixx because even though he had a simple style, he's written so many good songs.