Just about any AAS will help maintain muscle mass while dieting. Sust (or other testosterone) will cause some water retention; about the same as deca. So if you're not happy with the softness from deca, sust may not be an option.
Tren is often used for cutting and will not cause water retention. And, if you buy Fina pellets and convert them yourself, it's very inexpensive.
Tren can cause loss of lidibo on par with deca. To avoid this you could add proviron with the Fina (which would further increase hardness and vascularity) but this would increase the cost to where it's roughly equal with winny.
I guess it's a matter of which tradeoff you're willing to make.