There is more infrastructure on the Le Puy so distances are more manageable than on the Arles. The Camino Francės in Spain is easier than either - and no-one has to start in St Jean Pied de Port and walk the Route Napoleon - Valcarlos is an easier option and the more historic route. Or start in Spain - the locals consider Roncesvalles the proper starting point and that is after the Pyrenees.
The other historic pilgrimage routes in France are the route from Vezelay and the route from Tours. Just be aware that walking in France is very different to walking the
Camino Frances in Spain. I think
this thread gives lots to think about, with opinions and comparisons of various routes.
If you just want to walk in France but are not wedded to one of the pilgrimage routes,
This website might also give you some ideas.