The rotary hammer drill is far superior. I have a Dewalt DCD996 but only use it in a pinch. If I know ahead of time I'm drilling concrete, the rotary hammer drill is on the truck. I have the Bosch RHH 181 cordless as well as a corded one. On new construction sites often there is no power and I can drill all the 1/2" holes I want with the cordless one. Typically drill about 30 and having a couple charged 4.0 batteries has never been an issue. Prior to buying the corded drill in about 2005, I used a corded hammer drill. The chuck was always working it's way loose and it took way to long to drill the 1/2" holes. With the SDS rotary hammer drill the bits won't come loose and it powers through concrete with 1/2" and 5/8" bits. I don't think Dewalt had a comparable SDS 20V brushless rotary drill when I bought the Bosch. They do now. The difference is night and day.