You can get Swiss chocolate in the airport for the same price as in Zurich city shops, and as getting into the city is quite expensive by Taxi, (but fast and cheap by Train) I would stay at the airport lounge and buy the chocolate in the air-side shopping area.
You will get great views of the Alps from either side of the plane, but as you fly west once out of airport space, and the Alps are mostly to the South of Zurich, I would book seats on the left side of the plane.