They use different myths Rob. With Buffy, it's more supernatural, as far as using nearly every single myth, like wooden stakes, crosses, holy water, etc. Blade, on the other hand, is more science based, meaning they most of the things used by Buffy ain't worth jack to the vampires Blade fights, though things like sunlight, garlic, and apparantly silver still work.
And, I put Blade over killing more vamps than Buffy easily, regardless of which vampires they are. While Buffy tends to duel it out with her vampires for like 5 minutes, Blade on the other hand mows through the same amount of vamps in a fraction of the time. And, if it does happen to be Buffy's vamps, and the guns don't work, then he goes old school and pulls out either the boomerand thing or his trusty sword and heads start to roll, before they turn to ash.