The main difference for me is the light design. I'll attach images to show what I mean by panel vs Puck. My radions are xr15s gen 4. I always ran all of my ecotech devices using ecosmart live with a reeflink. This was how to control them online pre mobius. (sorry of your aware of that already) I made up my mind I would never buy radions because the newer ones only work on mobius and I hated Mobius when I tried it before. I still do not like it but am adapting but only because I wanted to add 2 more MP40s recently and they only run on mobius. I went ahead and upgraded my xr15 to Mobius also. I wouldn't spend the money for radions these days but that's a personal decision.
I'm about a year in with my photons over my SPS tank. It's mostly acro frags that are encrusting nicely. I have kept fleshy lps under them also and they did well. Photo are just snap shots from a moment ago
These are the two photon 32s
And the xr15s. Notice how much light spill compared to the photons? The tank with the photons is in our dining room so that was a concern when deciding on lights. Also mounts have to be made or purchased for radions.
IMO you really can't go wrong with most lights on the market these days.
Just for info this is my 180g under 6 Noopsyche K7 pros. Tons of light spill but they are in a canopy so it's not an issue. I really like them and for around $1k for all 6 it was a bargain I think. I've been running them maybe 2 years or so. The tank has been running 8 years and has never looked better.
Almost forgot about the photon 24. This is it on the reefer 170 with a 4 bulb t5 hybrid on top. I didn't really need the T5s but had the fixture and the nem seems to appreciate them.
Sorry for being so long winded. Hopefully the comparison is useful to you and maybe others. Good luck with your decision.