My son loved No Fear, because it said funny things and it was pretty easy to understand; he loves SST for the same reasons.
My daughter really enjoyed Power Play when it was here, she was 6 at the time. Slower and easy to understand. Now she would like one that is pink.
Neither love Rocky and Bullwinkle and I thought that would be a win. I have it pretty steep and I enjoy it a lot.
Kids really like the 90s Gottliebs. SF2, Mario, Shaq Attack. Simple rules and easy play.