[quote=@Flamelord]
<Snipped quote by Raineh Daze>

Yeah, but the Gunbuster aliens only have numbers going for them once the titular robot goes online. Everything gets one shot like no tomorrow. 

...Now, the Diebuster aliens are tougher, but that's because they go 'Screw you, black holes."
[/quote]

That's slightly inaccurate. The difference between Gunbuster and Diebuster is that one is the aliens at their peak, the other is a single specimen that's been feeding on something created in the aftermath of Gunbuster's wrecking of everything (and a mook). Gunbuster and Nono could probably be swapped (well, not story-wise, but ability) and manage each others' fight scenes. :P