I never did either, but my opinion about age is to keep things strictly based on real hormones and not derivatives and preferably DHT, your endocrine system and CNS will thank you later. However you may want to utilize anavar at your age, you can grow taller with Anavar if your still growing of course. Dose it at 2.5-10mg for this, problem is it's not going to yield muscle gains being that low.

Differences in the two now. Var has a high anabolic to androgenic ratio since it's androgenic activity is very minimal and low enough that women can use it. DHT is fully androgenic and slightly anabolic. I could be wrong but each may be around equally anabolic