Ditto Les Arcs.
Also, around Molini Di Triora on the Italian side of the Alps, where Rivierabike.co.uk inhabit.
Lots of variation in both locations with plenty of flowy singletrack – assuming a suitably knowledgeable guide of course.
Alp d’Huez is fairly flowing but its definitely of the DH variety. The Mega route is fairly flowing and very good fun.
Also, the people who put sign posts there seem to have a strange sense of humour….like big random 6 ft drops on the red routes if you take the wrong fork in the trail. You generally see it well beforehand but red grade?? At the other end of the ‘red’ spectrum are tame loops in the valley that wouldn’t even pass as green routes in the UK. Most bizarre.