Looks like the high peaks are actually more due west of the Monroe skyline, so I would think a NW wind would actually avoid downsloping? In my experience a WNW wind is actually best on account of that N-S orientation you mentioned, depending on Froude #s.
But yes, lots of moving parts to figure out something like that. In a classic NW flow setup with a froude around 1, it seems like Stowe generally does 50-100% better than SB. Definitely event dependent though.