deca is not oral. Winny is oral. If you just want to maintain muscle while losing weight, deca might be better for you, though you will hold some water while on and wont see the total fat loss until you're off the deca. Personally I say deca because I don't want to risk any further hair loss. But winny is solid, aside from the effect on the hairline. If hairloss isn't a concern, go winny all the way!