Get the large lenes.

I think a perfect set-up (especially for a full-time sportsman like Doug R has become) would be to get a dark pair for really sunny days, and a lighter brown or grey set for mixed conditions of sun and clouds or early morning.

UV protection on lenes is supposed to be very good on Maui's. I happen to really like the lenses.

In the old days, the Porsche models with the interchangable lenes were really good. But they are VERY pricey. I you needed custom lenses, it was easier to change them out.