Reapers because two reasons one the supernatural beings in Buffy would be slaughetr by any supernatural beings i Blade because a they don't have any added straight tere just immortal and thier faces contort into those weirdnfaces so basically anybody could beat a regular vampire form Buffy so that would mean that the super Vampires from Buffy would be about equal to a regualr vampire in Blade may be less then the ones in Blade, and if 8 elite vampires from Blade go and ttack these things and only two come out alive that means tthat they are pretty toiugh SOBS. sothe reapers would win.
The uber-vamps have enough power to kill a super-vamp from blade, it just could never come off across tv that well without spending an ass load of money.
The uber-vamps were stronger than slayers by a little, but slayers could still handle them, a vampire from blade is about the same strength as in buffy, but the 2 vamps were talkin about are not so equal, the uber's are a little stronger, but probably wouldn't know how to kill them.