Ghost and Boris i don't think you could just compare MARCOS and PARA,coz both are of different roles,PARA may not work with ass much as eas MARCOS does in amphibious environment,same goes for MARCOS in desert or mountains.Also there is very big factor we are not considering,PARA draws men mostly from infantry who are trained from the very beginning on land warfare,how to respond to an ambush etc,where as Marcos are exclusively from naval men who don't have that much basic training in land warfare.
But at the same time i do have some doubts on the capabilities of PARA on earlier times as 21st PARA for example was converted directly from a pure infantry regiment to SF overnight and said that all the officers and en were SF qualified .Lol.
Considering the casualties of PARA,it is the high brass that had to be complained of to call PARA for each and every operation when RR could do the same,so maximum number of ops means heavy chances o casualties.But the operational experience is another matter which adds up the quality off any SF.
PS:Rcently i had a chat with a military nurse in Navy he said that couple of years ago he was stationed at SriLanka attached to the MARCOS unit stationed there.Though he couldn't share much as he was just a nurse and not MARCO,though he speculated that our SF had played some role in the downfall of LTTE.