I would say D-Bol. They both do about the same thing in regards to desired effects, but D-Bol is stronger on a mg per mg basis like Montana said and D-Bol doesn't bloat users up as much as Anadrol. Also, appetite is enhanced with D-Bol, where Anadrol seems to make users feel sick and it doesn't stimulate appetite. This is terrible when you're on a mass cycle. Retention of gains from D-Bol is a little better than Anadrol, probably b/c D-Bol doesn't cause quite as much water retention as Anadrol.
D-Bol is the most popular oral steroid and I don't see this changing any time soon. IMO, it is the best oral steroid for bulking!
NN