It was a toss up. There was an Amp sale (with a rebate gift card) just before the holidays one year, so I went with Amp. That said, here are a few thoughts on the differences.
With the Mopar steps, you could use AlfaOBD to enable them in Uconnect, so that you could stow/deploy them from the screen. Not sure if/when AlfaOBD will work on the RHO, though. Amp steps, on the other hand, do not have that capability. The steps I bought are the “Smart Series”, which has an app (via Bluetooth) to remotely stow/deploy them. So there’s similar functionality, I guess. But I found it to be nothing more than a novelty at best. I’ve never found the need to manually operate them. Whenever I park and want the steps to stay out, I just keep my foot on the step to tell it to stay down. So in my mind, there’s no appreciable difference between the two.
I’ve never had Mopar steps, so I don’t know if they operate as a pair or independently. Amp steps are independent. So when I open the driver side door, only the left step deploys. My wife has a Lincoln Navigator, and both sides operate together. Seems like needless cycling if only one side is actually being used at any given time.