The smartest guys are in brisk period no one argues with out.
Now what�s a lot more important then being smart is actually learning itself not just growing your Payos and saying your in brisk now I�m not saying brisk guys don�t learn ofcurse they do some of the best massmidim our American Yeshivas produce are there.
But their is a portion of brisk that are just there to say I�m in brisk while doing nothing the whole entire day and yes their are mir guys who do nothing but mir is a 100 times the size then brisk and brisk is sopposed to be the best.
An average mir guy who learns all the time is learning more lishma then a brisk guy just because he not learning to say I�m in brisk and prove everyone he can learn better then you and is smarter.
My dira was half brisk half mir so I�m a pretty good source