Very good question and the short answers are above, but more specifically:
Firstly, steroids don’t transform your body. You do so via your dietary and training regimens.
Anabolic steroids are medications, and although in the same class...muscle promoting (generically speaking), they do have specific emphases. Thus, although not ideally suited for cutting, you can cut on Test E and Dbol. However, the propionate ester's innate properties (SEE:
http://forums.steroid.com/showthread...icle-on-Esters) better equip Test Prop for this task, making it and the leaner muscle generating/proven fat-burning/vascularity enhancing Var better cutting choices, and vice versa for bulking.
This is precisely why we have a Profiles Forum (
http://forums.steroid.com/forumdispl...PROFILES-FORUM), so that you can research gear to more closely align your goals with those compounds which inherently promote them.
Best to you.