We're not talking about the bunny from Monty Python here, these are normal bunnies and normal kittens. Bunnies have ears, kittens have teeth and claws, not to mention a killer instinct. Kittens win.
Getting a holy grenade is no problem at all. I've got one right here... no, wait, that's the cursed grenade. Hmm, in that case, where did I put the holy one? Gotta be here somewhere...