Honestly I believe the gripper is the best stock ski any manufacturer has ever had come stock on a sled.
With that being said though, the rubber bump stops drive me insane always blowing out, and if you have the front severely weighted...ie: say heading downhill on your side and are trying to hook back uphill and encounter anything in the way of hard snow, an old track, a hole, etc the ski folds verticle and "stuffs" you pretty good throwing you over the bars lol
So in saying that I vote for the C&A mtx's. They float ridiculously well, and nice and mellow for easy initiation of carves/sidehills and allow you to stab thru things instead of the ski folding...oh and the rubbers are near bomb proof!
Here's a little pic to show you how much float they provide!!