I think that these skis are extremely different from one another. I have only tried last year's ARV, but the shop flex seemed very different (the Thunder is a stiff and, from what I have been told by my shop techs, a demanding ski that rewards very strong skiers). The ARV is, by my recollection, quite soft and forgiving. Be sure to research and/or demo very carefully. More info about your level and where you usually ski would be helpful.