Your answer probably lies in the type of skiing you like to do. If you ski more off-piste and/or like speed you'll probably like the 86 better. If you ski mostly groomers and don't ski mach 1 the 80 may be a better fit.
I have the Motive 80's. I mostly ski in Michigan so conditions are similar to yours, but there are not nearly as many off-piste opportunities here. IMO, the Motive 80's are pretty lively, hold an edge well on hardpack/ice and do reasonably well in the bumps and trees and they doesn't punish you for mistakes. They do have a "speed limit", but I don't typically ski really fast so that doesn't bother me.
If you search the forum, DawgCatching did a review/comparison of the Motive 80 and 84 (replaced by the 86) that is really good. I think its a year or two old now, but I don't think much has changed in the design of those two skis.