I'm 99% radio only listener (MLB At Bat), so my favorite pair is Levering and Grindle. Of course Ueker is "the man" for home games, even though I've heard some of his stories a few times. Josh Maurer with Grindle is also good on the radio; Maurer seems to be finding his groove. Brian Anderson is top notch for TV, but as someone has said, he's basically just a guest announcer. I don't know, think, or care much about the other TV guys (except Levering).
ASIDE: I have not studied this carefully, but when I listen live on MLB At Bat, it seems that all of the between inning ads are either generic national or aimed at my local (New Orleans) audience. But if I listen to the archived version, I get the Milwaukee and Wisconsin ads. These are still ads, but they're more interesting than the same old Blue Nile mail-order jewelry and local Medicare Advantage cr4p.