Primo is pretty much like masteron. It's not too great for gaining muscle, but it's good for hardening up a bit and it won't cause any serious sides. This is the reason it is preferred by women, plus since they use less of it than men it would be more cost effective. Var would be your better choice.
Cheaper and more widely available. You'd still have to use a large dose though to really "feel" anything. Again, var is more of a female drug for the same reasons given above.