First, the name prohormone is a misnomer...let's just call them what they were until recently, OTC steroids.
MG for MG I get better gains with injectable 1-test cypionate than tren acetate. The sides vs benefits is up to the user but I prefer the sides from 1-test over tren. I'll take a little lethargy that clears up after two weeks over night sweats and insomnia any day. It was also A LOT cheaper at roughly $3.00 per gram and easier to convert.
M1T is far superior to methyl-test as far as sides vs gains, I've never had so many sides from a drug in my life and gains were minimal in comparison to sides. IMO, Primo is useless unless you are extremely worried about sides, have a reliable source, dieting, and have a lot of money to blow. Offer me $1,000.00 worth of primo vs $1,000.00 of what I was paying for 4-ad cypionate powder and I'll take the 4-ad cypionate.
However, nothing compares to my favorites...test and EQ... If you didn't have a good source and had to pay "gym prices" or were worried about legal issues "pro-hormones" were an excellent option. Now that they are legally the same there is no point, just find a good powder source.