Driving from Nice

Driving from Nice to Serre Chevalier next week. After perusing maps and Michelin/AA routes there seems to be several different ways to go with conflicting advice as to which is best at this time of year. Wondered if anyone on here had driven up from the South. We have driven from Nice to Valberg no problem but much nearer than Serre Che. Have also driven from Marseille to La Joue du Loup (one route 2.5 hours)Go to the southern airports because much cheaper as I teach and have to always go in Feb half term.
The shortest D902 looks very slow via Rissoul. Is it closed in the winter? Other option seems to go via Turin or Gap any comments on either of these please. Would appreciate your experience of any of these - Going on the 11th Feb. Thanks

Ive only driven to SD from the north, via Grenoble.
At least you dont have to cross the Col!

Intersting. I'll have a look at the map and come up with my suggestion.