I have used both, and I never got the back pump from anadrol. Dbol at 30mgs a day plus 400mgs test and 200mgs deca gave me massive pumps, everywhere, and my lower back would get so pumped up that it would hurt. Sometimes my legs would feel that way too, walking with a huge pump was a little awkward.. I felt so swollen it felt like I was going to explode sometimes using dbol. Nothing to do with kidney problems though, just way to much water weight bloat.
I had the same strength gains using half a 75mg anadrol tab a day in place of the dbol on another cycle, no crazy pumps though, but just as good strength gains. Only problem I have with anadrol is that it gave me high blood pressure while on, giving me headaches, which I didn't experience with the dbol.
I don't believe that anadrol is as bad as most people make it out to be, i like it, but only for 2-3 weeks for myself.