I would personally pass on both if it was to be a shooter.
There are enough Mausers, Enfields, Moisin Nagants, Swiss K31's and other great surplus rifles out there that you can have fun shooting without going through the hassle of finding extremely oddball ammo and then paying a fortune for it just to shoot it a few times.
That's just my take on it though. But if I intended on shooting it regularly, I'd want to know that fairly cheap and readily available ammo was out there to actually shoot. It just doesn't seem like there's alot of ammo in either caliber around. The French 7.5 ammo doesn't seem to be that readily available here in the US and the Italian 6.5 is downright rare and you'd have to get it from the Old Western Scrounger.
Now if it was more going to be a operational wall hanger that could be shot if you wanted to, then knock yourself out. But as a regular shooter I wouldn't bother. I've heard that some of those MAS 36's have been converted to fire .308 Win, if that was the case then maybe.