The Crampons use DU bushings. They don't spin like bearing pedals either, which I've actually grown to like. I know what my pedals will be doing if i take a foot off. The Crampons have a VERY simple rebuild process (the Amps probably have a similar design). I've been riding mine in southern utah silt/sand for over a year now, and haven't needed a rebuild. Nowhere even close to it yet. But when the day comes, it's just a quick removal of a lock nut, pull out the bushings, put new ones in, and bolt back up.I'm not sure what the Crampon axle system is, but straitline pedals don't spin freely like bearing pedals do, so take that into consideration too.
The new Atlas pedals do look pretty sweet, would love to try a set.Why limit your choices to only these pedals? I've tried both and found the Amps to be smallish platform and spin resistance is really high. The Canfields were better but they seemed to develop play easily unless you stay on top of maintenance. I've also tried HT AE01, Point-One Podium, and some other higher end ones and eventually settled on the Hope F20s... best of breed IMO... zero maintenance in a year and they still look brand new after being bashed on DH bike.
The new Raceface pedals look pretty stellar as well, and Chromag has a couple of good options.