I'm interested in getting opinions on which types of silent lights are best.
There is no "best."
I have the Quanta Atlas, Quanta Pro, Orphek OR2, and Mitras LightBar3 (and 2) here. I've tested the original Straton. I have not been hands-on with the CC2s.
The original Straton is a work of art, but it's ridiculously expensive. The same is true for the Pro. If you're chasing a vanity tank, this is a pretty choice.
The Quanta Atlas is $500, it's incredibly powerful, it's very efficient, and it mimics 14,000k MH. It offers switchable output and 0-10V dimming. I dig its industrial look. Think of it as your weird uncle's Chevy Nova with a rat motor hidden under the hood. Not a looker, but will show the pretty ATI what's up.
The Quanta Pro is better than the Orphek offerings in terms of color blending, and the Helix improves on the Pro's design by adding native dimming and even better blending down the length of the bar. Something to consider is that the Quanta bars are intended to be fit together like a spectrum puzzle. Luca can help you target your look by using multiple bars.
Orphek is just Orphek. Depending on the bar, as you move down the length of the bar measuring spectrum, that spectrum changes (meh blending). That, and you ain't gonna get US support like you would from the Quanta.
The Mitras LightBar3 is what you'd expect from a Mitras LX7, but it's in a bar form. When used with any current generation GHL controller (like the Light WiFi), multi-channel, dimming, season table, moonlight (any channel), and most anything else you'd expect from a GHL fixture. They are also one of the few lights that include actual UV diodes. I've been running the 7206s and LightBar2s for quite a while, and they are very reliable.
I can offer marketing-free data for any of the above.