Royal Marine Mountain Leader (RM ML) vs SAS Mountain Troop

[warrenf]

Good evening all,

I hope all is well.

I am new to this forum and so I would appreciate your patience and understanding. I have thinking about the following question for a while and wondered if someone here could help me understand the answer to it better.
What’s the difference between a Royal Marines Commando Mountain Leader and an SAS Mountain Troop soldier? What are the differences in their training specifically and which is more difficult? Would a RM ML train the SAS Mountain Trooper or would it be the other way around? Thank you.