R3d isn't done on the Afterburner card. It's implemented via Metal to get GPU acceleration.
I wouldn't be surprised to start seeing Agilex cards elsewhere, not just under the Afterburner brand. Intel is most likely going to be happy to sell it to others... especially with AMD's repeated drubbings. ?
I'm using both Scratch and Mistika right now. Both do some things extremely well that I wish could be combined into a single application sometimes.
In general, I prefer Scratch's UI, but Mistika is a wonderful compositing application, and I love how easy it is to simply roll your own delta keyer using channel booleans and the clean plate node. I honestly have no idea how to go about setting that up within the timeline itself, but it's nice and easy in the node graph (which is why I couldn't set it up in the timeline -- I didn't try to ? ).
Speed... Scratch. Nothing comes close. Mistika finally got into the ballpark with the new Red SDK update, and I suspect that Resolve will be close now also.
The visual grading tools are very nice in Scratch. Being able to click on a point in the image and manipulate is rather pleasant, even though you can easily mangle the whole thing.
Conforming in Mistika is kind of a pain. That has actually been the main impediment for me in using it on more projects. The tools are all there, but they're clunky as all hell, so generally I don't much like conforming in Mistika. There's no elegant way to view the reference video along side or over the raw video, and there doesn't appear to be a particularly straightforward way to simply replace a clip. In Scratch, you select the replace mode, hunt down the clip you want to replace the erroneous clip with, and drop it in place. Then you just type the right timecode into the "in" field for the clip, and Bob's your uncle. I wish it were that easy in Mistika. Hopefully there's a nifty trick there that I don't know about yet...
Most of the time however I can get a pretty clean conform from Resolve using AAF, so for dicey conforms I sometimes just do the tedious part of it in Resolve which has by far the best editing toolkit of the three (no surprise) and export an AAF. That's usually almost 100% spot on, and saves a lot of work, though I think it's a bit comical to be using Resolve as a conforming tool ?
The Red SDK update with Mistika 8.8.10 made a big difference. It's a LOT faster now, to the point where it wasn't usable without a monster machine similar to Jan's, to now I can use Mistika on my ZenBook Pro Duo. I can't really get much use out from the 2nd monitor on my machine in Scratch or Mistika. In Mistika, not at all. In Scratch I can only use it as the second monitor in dual head configuration, which mirrors the AJA output.