i like to use my kc pro aviar for putts inside the circle on nice and safe greens. if it's outside of 10m and/or on a dangerous green, i'll typically use my DX aviar pna to limit roll aways, bounces..etc.
i've used a DX Aviar pna for ever but just recently moved to a KC pro a few months ago. I'm really liking the extra stiffness which helps my release. My style is kind of in between push and spin putting.
I seem to rotate my putters. I will use Soft Magnets and Challengers especially in the fall and winter months. Last summer I was using FLX and D Challengers. So I guess it depends what is feeling the best for the conditions I'm playing in.
I Normally I use a DX Aviar within 12m anything outside that I am using a classic roc, it just seems to fly a little better for those long range puts.
I am currently practising for a 150 class event and using DX XD as it kinda mimicks the classic roc. I am finding the change quite a challenge with the lighter discs bouncing off the chains I may have to go back to Aviar in 150..