For the record, from very early in my training I always roll into base leg while deploying two stages of flaps. It is fairly instintive for me at this stage to come down from circut height to be nicely established on final; carb heat RPM to 1700, Flaps and forward pressure to maintain a decent airspeed.
That said, the approach on the other end of the runway 'seems' longer and I generally throw down flaps on base and the final stage of flaps after clearing a hill on the final approach path. (Whereas three stages are not generally required on the other end of the runway). I suppose as well as considerations toward the aircraft flown and the pilot flying it, consideration should also be made to the requirements of the approach pattern and local features such as terrain or built up areas. I would be confident that I can make a smooth descending turn in a clean configuration, with flaps or simultaneously deploying flaps and personally, I think that is crucial.
Ryan