There’s lots of lovely waymarked blue and red under the vallandry lift, it’s probably more red by UK standards but kinda hard to compare (it is mostly dug forest floor rather than gravel-topped trailcentre). Natural-plus sorta thing. I didn’t do an awful lot of the higher up blues, they were mostly pretty open and dusty and possibly a wee bit charmless but still good. You could definitely fill a day on these trails.
Tignes up the valley probably caters better for beginners, though again the blues and greens are a little harder than uk blues and greens- the greens are narrower and, well, more like mountain bike trails. By and large the trails are far lower quality at Tignes (IMO) but it’s a really fast and easy place to navigate (Les Arcs is a bit spread out, Tignes all comes off 2 lifts that start in the main resort- probably the chairlift side is better for noobs than the gondola side) , the lifts are free, you ride straight off the hill into the pub… So it’s really good for a brain-out easy day, more of a UK trailcentre experience.
Or so it seems anyway; whenever I’ve been at Les Arcs I’ve been following people so maybe it can work in a whole different way.
PS, if you can, make a day for proper riding at La Thuile, it’s the best place I’ve ever ridden. Like Innerleithen on a proper mountain (only drier).