It will be double the price with half the features.
Probably double the price, but for peace of mind, and the confidence management already has in Rockwell, I would pitch this to other people in my company compared to E w o n.
Also, According to that UL Compliance document, seems like it might be a ubiquity device badge built for Rockwell. They've done this before, for example the 9300ENA was also a badge built device from some other smaller brand(It was printed on the PCB inside), sorry I don't remember which.
Now it's Ubiquity, and they might have a lot more features integrated, as their networking range is really premium. If it doesn't have certain features, I would assume that just means that Rockwell wasn't able to vet them to endorse it yet.
Rockwell and Cisco (Who definitely are industry leaders in networking) have an alliance:
https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2020/pdf/BRKIOT-2600.pdf
I do trust Rockwell's design decisions for their end devices. Given this, as someone who's an engineer at a plant, I would not even think about endorsing smaller brands, at least not as a blanket technology, to other engineers at my plant.
As for remote access, this really isn't the only solution. Most plants/companies now have their own VPNs, why bother bypassing a companies VPN and going through some 3rd party which probably doesn't have a liability contract with the local plant, especially when it's a very targeted program.
My 2c.
-PreLC