A lot of this, I feel, is going to come down to personal preference, ultimately.
I have 3 12W+ sabers now (reviews coming on 2 tomorrow...) and all three are insane and I love them. I don't like the crystal reveals because they're not duel worthy. Or rather, not warrantied for dueling. The chamber may close, but structurally it's still the same inside, and the vibrations of impact during a duel are more prone to damaging crystal reveal sabers over a standard.
As for brightness... Wattage of an LED is not necessarily indicative of brightness.. that would be lumens. That being said, the RGBA isn't as bright as a full four-die color lit solidly, but nor is it dim, by any means. Especially when you start mixing colors, getting 2-3 die lit... and it also offers the ability to go into the color editor and literally create custom colors with any color mix at any point in time without needing to go get plugged into a computer. SO! There's definitely a lot of benefits to that. And the multiple soundbanks on the hero tier are just... nice. Just... lovely, lol. If you're anything like me, you'll get bored of the same soundfont EVERY day, so. It's nice being able to switch it up from time to time. =D
I don't have any picture comparisons for 12W+ vs standard 12W hero... but. Also, just in case you didn't know, cause it wasn't mentioned... the 12W+ is available in hero tier now as well. So! You can still get the improved LED/more brightness in the RGBA.