Originally Posted by cristal
Do SDS (bulldog type) drills perform significantly better?
Well, sort of. SDS is a bit shank type that is held by certain chucks. It's not the SDS per se that helps as much as getting a rotary hammer specifically, as opposed to a hammer drill that's not a rotary. A rotary hammer uses a piston instead of a clutch so it's more efficient and powerful. The SDS works hand in hand with that because the bit can slide back and forth.
So to sort of answer your question, rotary hammers perform better than regular hammer drills. Rotary hammers normally come with some form of SDS.