Hard to say who I like best and my exposure to jazz is limited (but heard a lot of Dixieland as a child - dad liked it).
The tunes/songs I like best are probably the more widely heard 'commercial' sorts the dedicated fans might call selling out. eg ones like Take Five, Watermelon Man, Girl from Ipanema. And ones like Walkin' Shoes, So What. What else they have done may not suit my taste - I'm not a big fan of other tracks by Miles Davis but I really like So What.
Hard to pick a favourite musician - so many are extraordinary talents. Lately I've been especially impressed by the jazz bassists, who seem so pivotal, even if other instruments are more out front. The bass from So What is awesome - Paul Chambers. Bob Whitlock on Gerry Mulligan's Walkin Shoes. For sheer double bass virtuosity - an Art Tatum of the double bass - the late Niels-Henning Orsted Pedersen.
Monty Alexander with NHOP -