Ben is an excellent rider but Valentin is younger with a lot more scope to improve. He'd be a French leader on a French team and for me their best (albeit tiny) chance at the next French TDF winner as it stands.
VPP has 0 chance to be a Tour winner.
Riders such as VPP rarely fight for anything more than a minor top 10 or stage wins. Of course BOC is the bigger lose. It's unlikely VPP finishes in a GT ever, let alone podium.