You have to keep in mind that St. Anton is a completely different kettle of fish from Lech/Zürs/Warth. St. Anton is the Austrian version of Alta/Snowbird with much higher powder competition, lots of expert terrain onpiste and off, and a big après-ski scene.
The worst agro-powder competition in Europe is nowhere near as bad as Alta/Snowbird or Jackson Hole.
I thought Grands Montets/Chamonix is the worst - outside of vertical drop - it's a relatively small area for Europe (smaller than Jackson - maybe even Snowbird and Alta) - yet the entire Chamonix Valley descends upon it on a powder day.
Verbier (8-16" new) was somewhat busy on a weekday morning , but no lines. After a 3-hour rush, it emptied out. Not skied out.
St. Anton (6-18" new on 3 mornings) - very busy on powder days in St. Anton proper when they could not open the upper lifts. But everyone makes their way quickly to Zurs! Zurs connects as efficiently to St. Anton as Lech by lifts. Or Stuben.
Other places in Europe: almost no competition in Ischgl, St. Moritz, Davos, Andermatt, Engelberg, Laax/Flims, Arosa/Lenzerheide, Zermatt, Courmayeur, La Grave, Les 2 Alpes, Serre Chevalier.
I thought Val d'Isere/Tignes and 3 Vallees were moderately busy off-piste - not crazy, but not vacant.
If I had to give "Powder Panic" awards to 3 areas in Europe: 1. Chamonix/Les Grands Montets, 2. St. Anton and 3. Verbier. But these are still far from North American experiences where everything gets tracked by noon.
My favorite choices in ski life in the morning: Whistler Village - Whistler or Blackcomb?, St. Anton - Rendl, St. Anton - Kapall, Valluga....or make your way to Stuben or Zurs?