St. Moritz is in the Engadin, in Switzerland. Courchevel is in Savoie, in France, inside Les 3 Vallées. They are both famous, and they are not alternatives on the same lift pass, the same currency, or the same law.
Courchevel is a 2030 competition venue for speed alpine, team combined, and ski jumping. St. Moritz is not. If the trip is the Games, Switzerland is a detour. If the trip is a town beside a lake with a different ski area, St. Moritz is that trip and this website is the wrong one to plan it from.
Nothing here is a return, a dividend, or a “which is the better buy”. Cross-border ownership is a job for a Swiss adviser and a French notaire, not for a ski guide. For a week in Courchevel, use the resort page. For the French purchase questions we are willing to touch, use property.