I ended up going with 2 Blues. I seesawed for a good 6 hours before clicking the order button, watching comparison videos and whatnot, and everything said that they’re equal in terms of performance, but that it ultimately comes down to simple aesthetic preferences. Me, I’m a sucker for that glowing fluorescent POP, so if I want to achieve that at it’s strongest effect, the Blues just seemed like a no brainer. The only lights the Pro has that the Blue doesn’t at all are the few green ones, but to my understanding, it’s a mostly unused spectrum anyways. The Blues have all the others in equal or lesser amounts. I currently run 2 Fluval Marine 3.0s, and I run 100% Blue, Purple, and Cyan, and then 5% Pink and White. Granted they’re way less powerful so I’ll have to adjust the Radions differently, but it still stands that I run very low white anyways, so doubling up the whites just didn’t make sense to me when I run them so low. With 2 Blues running, I still have 12 different whites between the 2 of them, so I’m sure I can dial in enough white to prevent that blue overwash look where it looks *too* blue.
Sidenote, I think “Pro” is a misleading name. It gives the illusion that the Pro is the optimal/superior model and the Blue is a step below it, although the prices are the same. It should be called the Radion Reef or Radion Organic or something. Just my 2 cents.