I am partial to Batter Up/Baseball. I like small flipper games with inlanes (there are very few), and this one nails the theme and art perfectly. Not a big fan of the other baseball games with no shooter lane (I don't like not having a plunger on an EM), and it doesn't really make much sense that big hit has an extra set of flippers and drop targets in the outfield.
Batter Up is simple, nails the theme, and the backglass animation is really cool as well.