Personally and not speaking from any experience and only ever 'worked' with them once for an hour or so (see above) I always thought of Gurkhas as jungle fighters. After all, that's why, since the war, their recruit training base was at Pasir Panjang in Singapore and JW cantre in Johore. Yep, Jungle fighters.
It was also said while I was in Malaya, that the Fijians were pretty good too. Not in my time there, but politics and all that..........