Since your friend will be low hours, it's best that if possible that he flies the same type of aircraft that he has trained in especially flying to unfamiliar airfields.
I once had the misfortune of having to take control from another pilot whilst I was in the RHS and it was not a pleasant experience. Flying RHS is very different. I know instructors do it all the time but they probably get used to flying RHS BEFORE it all goes wrong not WHEN it all goes wrong. So an aircraft that you are comfortable with from the RHS is an important consideration.
And I'd give the cherokee six a miss on the basis that everything goes bad the same as any other aircraft only quicker! Stick to a non complex 160hp maximum. There may be insurance issues with a high performance complex and a low hour pilot in any event