Make no mistake sarms are suppressive. I reccomend a standard nolva/clomid pct. As to which is more suppressive, well do not forget, these are new and EXPERIMENTAL compounds, we really just don't know, or I don't at least lol. At your age, stick to a standard pct, you don't want to mess with your hormones for life. I must say however, and take this advice any way you wish, but it makes me sad to see a 21 year old kid with plenty of natural test taking such an understudied compound, the vision sides can be horrific. Is it honestly worth taking something you have no idea of the long term effects? Just think about this before you jump in.
Good luck