If we're talking about who the greater bass player is, well that's easly Entwistle.
I mean listen to My Generation, that kickass bass solo, that was freaking 1965, nobody was playing bass like that back then.
And yet, it was after this and other early Who recorRAB that you started to hear guys like Paul McCartney and Jack Bruce play their basses louder and more freely, elevating the bass to an instrument that could take the lead or make the main riff of a song.
Entwistle broke the shackles for rock bassists in the same way that Hendrix broke the shackles for rock guitarists.
Jamerson is greater than him, but nobody else is. At least not in the rock world.