The GPL has been pertinent to several court cases. We know it is strong because it has been "battle-tested".
Can the same be said to be true for the MIT license?
There are no court cases I ever heard of, as of this date, involving the MIT license. I am not sure there is anything on BSD either (short of the Berkeley vs. AT&T feud over Unix, last century, maybe). This BSD issue came out close but never went to court. In fact things rarely end up in courts with FLOSS licensing and are mostly resolved amicably, as they should be.