These two alternatives for the same stretch, depending on your preferences. The first, via the Col des Mosses is easier, better road generally, but with more traffic and villages than the southern route via les Diablarettes. From Aigle, the climb up to the col is really fun and down the other side. Once back into the foothills it runs through some picture postcard scenery through tons of little villages, forcing your speed down. There is a fabulous little stretch through a gorge alongside a wild mountain river just east of Chateaux d'Oex.