We have two 163 3" Axys Pros.
Bought them used, late in the season but first day out was 3-4' of fresh. Awesome!
Val (5'2" 115 lbs) made the transition from her Pro Ride like a champ. Throwing it around and burying her shoulder in pow turns. She loved it. She probably would love a 2.6" also but she has never ridden one.
I looked for the 3" for chaincase, aluminum rear bumper, solid snow flap and they are more unique when it comes to resale. Plus, if I hated the 3" I could always put on a 2.6 and sell the 3" track. I don't see that happening though.
Riding style does change slightly... In deep pow it's the same. In more setup snow you have to be more aggressive with the throttle to keep the track spinning to pivot-- if you let off the throttle, the lugs grab and send you forward.
With a rain crust and sugar underneath, you needed to be careful with the throttle opening-- smooth to stay on top and drive forward versus hammering the throttle and sawing down through the rain crust.
Overall, stoked on the 3", thinking of picking up a 2.6" Power Claw (3.0" pitch) to try it out also.