The first time around we tried some ridiculous edge step up with a separate piece of edge underfoot, turned out terrible. After that we've gone to a traditional full length piece of edge.
I've ridden mine for a good 20+ days in the park and I am not nice to them, rocks, trees, disasters, I beat them up pretty good in a normal day. No edge cracks yet, no terrible base gashes, barely any chipping on the topsheet. We added semi cap to the topsheet, which has reduced the chipping by a great margin.
ON3Ps have a great track record of being a solidly built ski, but it comes at a price. More durable materials mean a heavier ski overall. Nothing that's going to ruin the performance of the ski, just different choices in materials create different styles of skis. Between the ON3Ps and the Frankenskis, I'm sure you'll be over the top happy with whatever you decide upon.