My first time to Morzine I took my 2006 s-works Enduro with 130mm forks, because that’s what I had.
It was fine.
Next time I took the same bike but with DHX coil shock and 160mm Fox 36’s, that was fine too but in a better way.
The third time I was on a 2010 Enduro with fox 36’s , it was ok but as I was always riding my hardtail those days, it took me a few days to get into the Enduro and get up to speed with not choosing lines etc, it was my alp bike and only got used in the Alps.
Forth time as third, still took me a few days to get up to speed, again
Moral of the story, take what you have that most suits the place and make sure you are used to it or the first couple of days can be a bit of a learning curve.
This time, I’ve only got one bike (Santa Cruz blur with cane creek double barrel and Pikes) so hopefully the getting used to it stuff won’t be happening. No mincing on day 1.
Edit, the best time I had was on the s-works, because I was used to it as it was my only bike.
As an option, buy a full sus frame and swap your bits over. My mate bought an old Commencal frame and took it to andorra last year, he survived and so did the frame, you could probably buy it from him if you like, I think he’d take £150 if it was offered to him.