Both will give you solid gains. Deca is more of a bulker AAS, but that is largely due to water weight. Good strength gains, and soothing joint relief. Run the risk of deca dick if you don't know what you are doing. Favorite is Test/Deca/Dbol as a winter bulker.
Primo is a great AAS but need to be run for probably 16 weeks. It is expensive, but it is the safest steroid going and delivers good solid, keepable gains. IMO, yes it is worth it.