Toi
I myself learnt in brisk and then the mir and u might b right that most of the top guys from the good yeshivos in america go to brisk but the biggest masmidim r in the not! If u wanna be part of a yeshiva for sure don’t go to brisk. Ull end up In achva down the block and if u don’t go with a group if guys ur finished. In the mir each shiur has a core group of guys that are really serious and they’re much bigger masmidim then the briskers. Of the 300 American bachurim by reb Asher there are 200 of them that can hold there own with any bachur in brisk (although idk y were trying to make it a competition)!