I have the choice of either going with Sustanon or Primo? In your guys' opinion which is the better of the two. As far as strength gain, keeping of muscle after, and side effects.
If you run 400mg primo you'll end up with close to the same gains as 500mg sust after all is said and done. The sides from primo at this doses will be minimal if at all, whereas with the sust you could get none of the sides or all. If you want to bulk pick sust, or if you want that "rock hard" look go for primo. Both are great