Replying to ACL Reconstruction (Pre Opp Advice)

Got myself booked in for Acl reconstruction surgery in a few months and just looking for advice on a few things.

What tendon to get the graft from? The doc said the options are patella or hamstring. Anyone who has had it done or knows anything which would you recommend? or if ti even matters. I ski park mostly if thats relevant...

Also anyone know the best stuff to do at the gym for both before and after the opp?

Cheers Gs