It really doesn't matter for your usual winny cycle (the liver stuff). Theoretically, injectables less toxic, but there would be little practical difference in a six week winny cycle. However, more of the injectable makes it to your muscles, so 50ed zambons is at least 75ed oral. If you go the oral route, make it count, do at least 75ed. Too many do 50ed oral (self-included) and are disappointed. 50ed zambons is so much better in practice, it almost seems like a different drug. 50ed oral feels like dbol with more joint aches. Given the facts the injectable is more potent and slightly less toxic to the liver (by avoiding first pass), that I think you would go with zambons if you can afford it. Zambons 50ed are a little stronger than primo and make you a little harder all over. An excellent drug, if you like that kind of thing . . . I'm a test/deca/tren man myself, but if you want to look pretty, zambons are a powerful tool with the right diet and training.