There is lots of posturizing regarding p-mag and h-drol, and really the best thing you can do would be to use both. People will react differently to each, and each has it's innate benefits. Both can be used for recomp, both can be used for bulk. Both can be had for roughly the same price: 26-30 dollars. Both are pretty mild as far as toxicity goes. P-mag seems to get more reports for increased strength and thickness, and i can agree to that. H-drol seems to pack on a few more lbs and a bit more water weight. The last 2 sentences are purely anecdotal, but it's what comes up often.