I'm gonna go into the hard sell and demand a lot of people voting on this particular subject actually watch Mobile Suit Gundam and Zeta Gundam because I'd be lying if I said neither of those are all-time great animes.
Sure, Dragon Ball Z is DBZ, but Mobile Suit Gundam literally invented the mecha genre and gave an incredibly serious anime about war.
Literally HALF the human population dies in Mobile Suit Gundam, HALF!!! In one scene, the Principality of Zeon drops an entire space colony on Australia.
Perhaps the greatest scene in the original series, is when Degwin Zabi, the sovereign of the Principality of Zeon, which through most of the series have been painted as the villains in all this, compares his OWN SON, Ghiren Zabi, to ADOLF HITLER... AND HE ISN'T EXAGGERATING.
Also DBZ's opening ain't got shit to the American Zeta Gundam opening. Fight me.