Possibly a bit stronger anabolic, availability for some people and price perhaps being the most obvious reason. There are those outliers who are sensitive to primo or vice versa. Some people just don't trust sources and always assume anavar and primobolan are fake. Just my thoughts.
I think both are amazing steroids to be honest, they provide similar cosmetic effect, similar gains, mild side effects and are like brothers or at least cousins.
When it comes to safety I think here primo wins. But then again I have had a discussion with
@Type-IIx and if I'm not mistaken he said at lower dosages they both are good candidates to cruise on. What we call now a sports TRT or TRT+, I guess.