Which manga do you think has the very best looking covers?
And which one has the worst? Post your opinion here.
If possible, include an example too.

Best: JoJo's Bizarre Adventure (example)
The best manga ever of course has the best covers too.
I just picked one at random, out of the 80 volumes it has.

Worst: Dragonball
I don't have an example but basically it's just a black front page and an ugly small pic which is all too often just taken from the manga itself. Gay.