Who's Your Favorite Bass Players; Why?

Geddy Lee, Tony Levin, John Paul Jones.

Based on my enjoyment of various recordings including him, no question it‘s Charlie Hayden.

I agree with everyone that has been mentioned. (Well almost) ;-)
In the Pop music world, coming out of the 60's I would have to say the two players I found to be most impressive were James Jamerson and Paul McCartney. Jamerson is a given by now I hope. (!) With the "Standing in the Shadows" movie and all. So would like to say take a listen to the style changes and tone changes bassist Paul McCartney added to many a great Beatle song. I think he showed some of the most creative bass lines of any "pop" bassist with songs such as the wild ride of "Helter Skelter", to the rocking "Yer Blues" to tripped out "Lucy In The Sky With Diamonds", to the sliding and bouncing "Dear Prudence" and many others. McCartney also put in solid performances on all of the other Beatles material throughout the years of the band while also writing, singing, playing guitar, piano, and even drums on "The Ballad of John and Yoko".
Last word.
Can I mention Mr.Verdine White bassist of Earth, Wind & Fire? He came up with some of the funkiest, most elegant bass lines to play along with EWF's great chord changes in the mid to late 70's. Any how about the dude Jimmy Williams (not a household name) who played bass on all that Philadelphia International Records 70's stuff. Like Teddy Pendergrass solo albums, Curtis Mayfield, the O'Jays, etc. Not a lot of notes but what a deep, deep pocket/groove!
Thank you all bass players! Keep on playing!

Jaco Pastorious,well the sound.

What, no Derek Smalls of Spinal Tap ?