1 3" coil VS. 6 2" coils?That 21 has plenty of power handling to take power all day. I vote the DP.
If the OP isn't retarded he should know to turn down the volume before anything bad happens. It's gonna take a lot of power to burn up that DP anyways1 3" coil VS. 6 2" coils?
assuming they have any WW they should dissipate more heat before thermal failure. More cone area too...