So what is your number 1 favourite cover art for a game?
For me it's 100% PAL Super DBZ, nothing comes close.
Honourable mention goes to Budokai 2, however having two Goku's on it and Vegito is still annoying to this day. Why didn't they have Goku and Vegeta with Vegito in the middle?
Nothing tops the cover for Dragon Ball Kai: Ultimate Butôden. It's more than your regular group shot. A few of the characters are actually interacting with each other.
Such as:
#17 pushing Gero's head down
#18 and Kuririn giving each other an awkward look
Gohan riding on top of Piccolo's shoulder with Videl looking confused
Freeza giving the WTF look at the Ginyu Force
Nappa and Dodoria smiling at each other for some reason
I personally don't care much for overly crowded covers. I really enjoy the simplistic but effective cover for Tale of Extreme Bravery (Buyuu Retsuden). Father and son standing back to back superimposed onto of the smirking faces of their two greatest adversaries. Super Saiyan Goku on the Freeza side and Super Saiyan 2 Gohan in his Piccolo cape on the Cell side. It's a really clean, good looking cover.
I wanted to say DBZ Origins too but that's probably cheating.