The OP is suggesting a choice of two. So for me it would be the massage (longer time) and HE.
Yes I am one of those old farts and I agree with Thephoenix about levels diminishing etc.
It goes further than that though.
I get sciatica from time to time and massage certainly helps. But it is just massage and I see a very good massage therapist for that.
For the sensual massage I don't need to be stretched and strained. I much prefer that 50 minutes or so to be teasing and edging to build up the pressure so to speak.
Yes I do enjoy the occasional 30 minute session of sex, but they are usually on the spur of the moment type things and I would have to say half of that time is spent giving oral. Gone are those pumping away hard and fast second round days.