Fortunately....or.....unfortunately, there isn't a perfect surface. If there were, the debate would be mute. And since everyone has their favorite(s), the issue will remain, a mixed one. Personally, I carry two....one slate and one glass. The glass comes in handy in wet weather and the slate is my go to for really soft calls. I am begining to warm up to the ceramic custom call. You can keep the K&H plastic pot calls....to inconsistant for me!
Bill