More quarters please...
What was your favorite arcade game growing up? What's your favorite game now? Tough call. Dig Dug, Joust, QBert, Donkey Kong, Pac Man - all so quirky and amazing and fun. Pac Man was probably my favorite in a typically kid "favorite" way - not only did I seek playing it a lot, I drew pictures based on it, got the record, etc. But I think actually enjoyed playing Tempest and Centipede more.
Now, still, I mostly seek out the classic game cabinets if I find myself in an arcade. But, in the more recent world, I've enjoyed DDR and that one with the skateboard controller.