Overall, hmmm. Michael League, Paul Jackson, Joe Dart. To many to say though. Like jamerson
ok, fair enough.
I honestly don't have a favorite. There are folks I really appreciate in different genres and for different styles/capabilities.
Jazz: Paul Chambers, Eddie Gomez, Neils Pederson, Ron Carter, Esmerelda Spaulding, Ron Carter, Stanley Clarke .... tons of greats here
Fusion: Jaco, Stanley Clarke, John Patitucci, Gary Willis, Alphonso Johnson, Michael Manring, Bunny Brunnel. ... tons of greats here too
Rock/pop: JPJ, John Entwistle, McCartney, Squire, Tony Levin, Glenn Hughes, Jamerson, Carol Kaye, David Hood, Duck Dunn, Chuck Rainey, Colin Moulding, Bruce Thomas, Pino Palladino, Leland Sklar ... almost too many to list
Newer/younger players like Justin Medal Johnson, Tim Lefebvre and Sean Hurley have caught my attention too ... I'm sure there's many more.
Listening to pretty much all of these guys over the years and trying to understand what they did that set them apart has been an ongoing education for me as a bass player and musician in general.