I like Congo. Interesting layout, fun gameplay. Not incredibly deep, but can be fun with multiplayer sessions. A little bit of an odd duck, but that's part of its charm. I tend to gravitate towards games that are slightly odd or unusual in some way. But, that's also sometimes why those types of games didn't generally have commercial success.
I like classic/muscle cars, but most car themes just don't resonate with me too much. Most of them boil down to shifting gears, beating the clock, and/or locking things up for multiball. Although with Indy500, you have the spinning car gimmick. I've only had a handful of plays on Indy500's, but it didn't really grab me like other titles do.