Im doing LST which is similiar, I dont think there are really any downsides to scrog or lst its just personal preference. my area is limited in heigth but got plenty of space around, so I pin the new upward growth every couple of weeks, what I got now is a bush, and every couple weeks after it grows up I pin it down and it makes more and more of a bush growing outwards rather than up. its getting big. Instead of having one large bud with smaller secondary buds the buds will grow all over because the inner part of the plant is exposed to light. I've heard scrog and lst producing higher yields in some circumstances but I cant say for sure. basically scrog is a good way to get a lot of nice sized buds in a compact area.