St Christoph is a pleasant change from the action at St Anton (it's soooo much quieter), and the glitzy prices of Lech. Being higher than both the snow conditions tend to remain better for longer, and most hotels are within a few dozen metres of the fast chair lift up into the main system. Access from here tends to be much easier than both St Anton/Lech as the one lift takes you to a good spot to get anywhere on the St Anton side, with easy ski/ride to the rest of the mountain, and down to the new Rendl lift that now simplifies getting to that area. As regards accessing the rest of the Arlberg region it is an smooth ski down to Alpe Ruez where the free local ski bus takes you to Lech/Zurs. I'd recommend Zurs for skiing, especially Tritkopf and Madloch on either side of the valley both having better snow at these upper elevations. (Run 33/33A to Zug always good)
In St Christoph do not miss the Hospitz Alm Restaurant, great for food-with-a-view and skier-watching. You just never know which royals/film-stars are around. Nice place, go enjoy.