All areas will have enough classics of all difficulties for a day visit.
Biggest driver for which is best will be the weather. Will be bloody cold and quite possibly wet or even under snow! Apremont is a little more exposed so tends to dry quicker. The rock is very fragile when wet so needs to be dry...
Recommendations will also differ depending if you have transport (bicycle, scooter or car) or walking.
Camping la Musardière where I've always stay rent pads but is closed over winter. Not sure otherwise as I've either travelled with a small mat or gone old school just buying a coir doormat from the local hardware store. Many landings are flat and especially if just cruising the easier problems or following a circuit you could manage okay with the later...