In reply to Oujmik:
50 m is fine for most routes at Gaillands and other valley crags. Just check you don't need to abseil or lower off on anything over 25m! Even if you did, you can get round it.The main crag, has ladders / walk off areas. On some sectors of Gaillands a 60 m allows you to lower off from 30m pitches.
There are some nice routes at Gaillands; a nice rib or two, some good grooves. IMO the best sectors are in the woods up and left of the main crag. For me Gaillands only as a stop gap if going somewhere higher is not possible.
Vallorcine, Dome de Chapeaux, Servoz also good. 50m is also fine for the higher crags such as Brevent, Plan Praz crags, Index, Floria, Crochues etc. 60m is usually for the snow / ice / mixed routes.