According to the forecasts Monte Rosa would be a safe bet. There could be other winners in the end, but Monte Rosa seems to get its fair share (up to 150+ cm predicted for wednesday-sunday). Furthermore, you can ski both trees and high mountain routes there. The base is excellent all around, even after the high winds during last weekend.
If you consider Monte Rosa from Geneva, I would advise to drive a bit longer, to Gressoney, to be in the middle of it all and close to some magic woods and the lifts up to Indren.
To be sure, @Niels
will have the latest forecasts for you by tomorrow morning?