I'd recommend doing Ops over Cabin Crew.
Ties in more from a technical point of view regarding what you would have learnt from the writtens.
I fully agree with the cabin crew argument regarding SEPs etc, but I think more can be beneffited in the long run with ops as you work directly with line pilots along the following lines;
Flight Planning
Fuel loads
Weight and Balance
Jepps
Rostering (inc Duty hrs, Split shifts, Diescression etc)
Telex (AFTN, SITA, IFPS)
Immigration
This is gonna be better applied when you eventually get a job flying, as oppose to cabin crew work which may keep you in touch with the airline environment, but very much 'out of the loop' from a pilot's operational point of view.
Try and remember that SEP's will be covered as part of your training - whereas a decent applied knowledge of ops is not, but would be a better feather for the cap.
Before you all start, I'm not cabin crew bashing (I'm not the type)!