Im partial to angel fire, and my nieces and nephew have done both the ski school and the private lessons and have been very happy. AF has good snow this year. We have skied the last three days.
We took our kids to RR when they were little. The lessons were great & RR is a great family place. Our daughter started out on skis & then after a few years she did snow board lessons. My kids are both good skiers so it must have worked. I would suggest private lessons for only your kids or if traveling w/another family put all the kids together in a "private" lesson.