When driving up to Stuben from the West the base station from of Sonnenkopf is visible from the highway. It is a classic family resort, small, good snow, friendly, and with the massive pull factor of Arlberg, most people never bother. You miss out. The snow is often epic with most terrain north facing. Freeriders used to be rare. This has been changing over the weekends. My favorite is the backside of the Glattingrat. Plenty of space and variants to go bananas with some huckable cliffs…

Entry: Get out looker’s left of the Glattingratbahn and stay at altitude until you arrive at the ridge. Staying right is generally the easiest way down. Straight, until you reach the forest trail, then traversing left all the way to Kloesterle. Variants are lookers left getting right over Glattingrat and riding the next bowl down to the forest trail via Thueringer Alpe. Half way down skiers right and skiers left are usually both possible. On the right side, ski on the ridge before turning slightly left towards the bottom. Skier’s left has many options. Avoid the denser forest far left. It is wild life zone if I remember correctly, illegal to enter.

Alternatives

There is one rarely skied variant climbing up to Nenzinggastkopf and on the Omesspitze. 
The entrance to the backside requires actually crossing over Omesspitze. It is a bit of a climb, you need stable conditions. But especially in spring, this one is epic. With more eastern exposure that gets sun in the morning, and little beats riding corn with mach speed. Plus I have never seen tracks here. There is further variants – ask us, happy to answer.