I have Puresound's 16 strand Custom model on my Yamaha AJ signature snare. To my ears, the 16 does the job. They cam with a 14 strand, but I wanted to get the stock wires off. I wanted to get the 20 Twisted model, however, I felt that it would drastically change the characteristic tone of that snare drum. The Custom 20 model will be fine, just watch the tension on your snares (as with all other snare drums).
FWIW, the AJ is an 8 ply Beech shelled drum.