I have demoed both and it kind of breaks down to what kind of skiing you do to what you will prefer.
Influence 115:
Hard charging ski, it has a good amount of rocker in the front, and only a little in the tail, it is pretty damn stiff somewhere between fischer stiff and volkl stiff. They are great if you are gonna charge some steeps, trees, glades, drops etc. This ski because of it's stiffness is only really comfortable at high speed and is really not so much about playing around. It means business.
Bentchetler 186:
This ski is capable of charging and going just as hard as the 115 but with a couple major differences. It has a ton of tip and tail rocker, and is a good deal softer (similar to the salomon rocker 120) which makes it much more of a surfy, playful, swivelly ski. I personally like to play around in the snow, butter, slarve, slash etc. and this ski is built for that but also for some serious speed, drops, and kickers. It is built with the heart of a park ski.
The 192 is allot stiffer with the same profile and acts (for me being tiny and weighing little) much like the Influence 115 with a longer turn radius making it a bit tough to handle in the tight trees and narrow steeps.
so the question is all in how you ski. You like charging getting your giant g.s. turns in the steeps and banging through the crud go with the Influence 115. You like playing around, buttering, riding switch in pow, etc. go with the chetler.
hope that helps.