No question, you won't find the customer service in VdI that you'd get in the U.S. (although renting packages to beginners/intermediates here doesn't seem to involve very much engagement and attention, from what I've seen).
My advice was aimed at a beginner/intermediate. If I were renting for myself, I'd go to Jean Sports, but they don't have much lower-level stuff and they are much more comfortable in French than English.
I've used Precision for my daughter and, though the staff were young, they were reasonably professional about fitting her with boots that were appropriate. The skis probably had beaten-up bases (to be honest, I didn't check) but at least they were new and she skied OK on them. As for Killy's it's a long time (ten years?) since I went there. My memory is that they didn't have more or better equipment -- just snootier staff.