Hey, Ive done both ostarine and s4..
If you look hard enough s4 is super cheap these days, i just ordered another two bottles.
Ostarine gave me noticeable strength gains with a little bit of size with no side effects at all.
s4 there are a little vision problems...i noticed it the most when your outside and you walk inside, almost blind...nothing major just dont dose it to high
To be honest, after taking both of them....not to sure which one i like more...vascularity is great on s4.