In your opinion.
I'll go with Andy Summers. Not a guy that cranks out all these solos but his riffs are just amazing. (If you asked me best drummer all time, I would probably go with Stewart Copeland, which is probably why the Police are so damn good) If your not familiar with his stuff, watch The Police Around the World (1982) It's a great music tour/documentary.
Maybe next two after, Eric Clapton and Eddie Van Halen. Those two don't have to hear anything else, you know it's them playing. I laugh that EVH wasn't officially credited on that solo for Michael Jackson's beat it, but it's like the most EVH solo ever, it ain't hard to figure out it's him.


Guitarist:
Eddie Van Halen, solely because so many other people have tried to replicate his work. Name another guitarist that’s been copied as much as him?
Steve Vai. YouTube “Steve Vai teeth of the hydra” where he plays a bass, guitar and sitar all at the same time. One could argue he is an Eddie Van Halen emulator although he trained under Frank Zappa. I mean he did a few albums with David Lee Roth too!
Drummer:
Steward Copeland is an excellent choice but I would put him at number 2 behind Neil Peart. You don’t even have to mention the band he was with because every rock music enthusiast knows.
Honorable mention - Mike Mangini, original drummer for Dream Theater. I used to like Dream Theater but they got way too long winded after Mike was kicked out. Watching videos of him play live are amazing.