I gotta say Naruto, mainly the Clash of Ninja series, although it's been completely overshadowed by the other Naruto games like Ultimate Ninja Storm or The Broken Bond. I really want to get my hands on the Japan-only release Gekitou Ninja Taisen 4 (Clash of Ninja 4), but I need Paypal and a credit card.
The DBZ games are alright, but I never liked the controls and none of the games really appealed to me for some reason. They're generally at a faster-pace than the Naruto games, but the fighting itself feels too 'floaty.' (Yes, I know they can fly, but it when you're trying to attack someone and they're at a slightly lower altitude than you, you can bet that most of your punches will miss or you'll dash past the person instead of towards them.)