Some are as slick as polished leather while others have an abrasive surface that makes it hard to fit your foot in the boot. Does a snug boot hold the foot in place or does it also require a sticky surface on the top insole/footbed? Which type of insole do you prefer? Which one gives a skier the most support? If you like the sticky surface models how do you keep your socks from bunching up when you put on your boots?
An observation; most stock insoles are slick. I'd guess that's to help make it easier to get in and out of the new boots.