14x5 for the YS 63 (and possibly the Saito 72) on the Aero Wing... Mainly because 6" of pitch is flying it too fast !
However, this prop will also be better with the FF wing than the 13x6, although with the 13 or 14x4W it will be even better with the FF wing.
I think the 14x5N will be a good compromise but if you want the best out of each wing separately I think you will need to be willing to swap props same time... no big deal !

DONT use ANY Castor in YS

Hercmate... you know I will always say the YS is a better solution.!!

But if you dont have the readies then go with the West and try diff props..

If you want a YS you know where to go