I've been with ski beat to Plan Peisey and La Rosiere. The creche at La Ros is spacious and purpose built so was great. Plan Peisey the room they use is small but the nannies were great and took the children out a lot. I preferred the skiing at Plan Peisey though. We're going with them to La Plagne this year and our 3 and 4 year olds will be using the creche again.
I looked at Ski Famille and love les gets, but have left it too late to book cheap flights. Easyjet are charging about £600 for the 3 of us by the time I've added on our bags. So I need someone with included flights (DH wants to drive which I'm not even considering with a 2 yr old )