IMHO, most ski companies have great durability if taken care of correctly. If you slam your shit on rails all day, you are gonna have problems, but at the same time, I teach everyday, and ski park/generally rip the crap out of my very soft line elizabeths, and they don't have edge cracks, delam, or rockered tails.
I generally avoid certain brands, or certain ski models, but it is more for design problems than durability. If you take care of your skis, tune them often enough, and don't abuse them, they will probably last you a few years. If you land backseat, and stomp the crap out of rails, you might do in within a month.