I do not know anything about ultradrol first hand.Beast is very effective but gains may not be dry and some people have issues with superdrol. I can tell you it will pack on gains quick! Epi is amazing for dry gains of lean mass and it is a mild product. You should run HCGenerate will any of them. Make sure you get pct and if you run beast I would suggest N2Guard. I have used both epi and beast and stand by them!