I’ve read things on both sides of masteron some say it’s a great ped others say it’s pretty much useless and purely cosmetic. Is this a good choice to add on size along with test?
No. Definitely at the bottom of the list for adding size.
Useless
Nope
Isn’t adding size cosmetic?
I am going to guess that what you are looking for in an additional compound would be found in EQ, or just more Test.
Cosmetic meaning just hardening you up not building size
Wild primo be a better choice or are they similar in muscle building potential?
Primo is a better choice, yes. But it is expensive, often faked and i think it is also low mgs per ml, and is needed in high dosages which means lots of oil to pin. EQ often called “poor mans primo” would produce similar potential for gains, for half the price and half the oil needed to pin. Pair it with a hefty dose of test and you have a solid off season blast with mildest bulking agents possible. Dont expect nothing crazy cause there wont be much water gains. Slow, steady, relatively safe. Will have to rely on correct training and keep diet in check so you are actually always in a surplus. I wouldnt do less than 24 weeks as it takes at least 5-6 for EQ to really build up. More than 24 weeks, ofc, would be even better.