We’re going this year for a week, staying up by the lifts and cycling probably every day. Kids are 15 and 11. Went to Les Gets last year and ended up most days getting over to the Lindarets area, which is a good 60-90 mins from Les Gets. Found the trails less wrecked and more enjoyable in Chatel and over the Mossettes into Swizterland, with plenty of cheeky/non trail centre options there.
It’s a fair point about there being plenty on in Morzine if you’re not riding every day. Bear in mind that Chatel village is several miles downhill from the first lift up at the bike park, so if you want your riding days to be car free then you’ll need to plan your accommodation accordingly. Morzine offers a good central location with lots of choice each day, and potentially car free, depending on where you’re staying.