Curious on why you want to switch from Fractal to NDSP.
I think you can sum it up best as that the many of the pros of Fractal didn't matter to me as much in practice (especially after getting over initial coolness factor, because yeah a lot of the Fractal stuff IS very cool) and the cons mattered to me more than I expected.
And then the QC Mini pushing me over the edge. In a lot of ways, it's what I wanted after the HX Stomp. If it had existed before, I doubt I would have gone for the FM9, let alone done all of my HX Stomp + Tonex and then tube preamp + Tonex experiments.
There were also some things I didn't like about the Fractal as much as I expected to soundwise, which made me want to integrate a couple external pedals, and the size of the FM9 doesn't really work for me in that case. The NeuralDSP stuff isn't better in those areas from what I can tell, but if I'm already adding a couple external pedals, then the QC and especially the QC Mini (which I'm aiming to get) work much better because of their form factors.
The v2 captures are definitely a factor too. Not sure how much I'll use them? I don't have any amps to capture right now, and other users' captures are more miss than hit in my (pretty brief) experience with captures in general, but there are a few rarely-modeled amps I'm interested in grabbing captures of (maybe from Amalgam), and I want to mess around with capturing some of my drive pedals.
And there are a lot of other little things too. Of course the Fractal amp modeling, reverbs, footswitching, digital delays, and routing flexibility are all amazing, so it's not a cut and dry thing for me and all the praise I've given Fractal over the last several months still rings true to me. It's more just "okay what has the best combination of things I'll actually use and in a way that makes me want to play guitar more and better?"
Part of me is very tempted to go with the AM4 instead to hang on to some of those Fractal pros, but eh. I think if I ever went back to a pedalboard setup revolving around a dedicated amp pedal, it would be with a (future?) NAM player or a tube preamp (like the Tone King stuff).
Part of me is also tempted to go for a Stadium or wait for a Stadium Stomp, especially since I love a lot of the Helix FX and I think Line 6 is a great company, but I have pretty mixed feelings about where that platform is at right now tbh. I might regret not investing in it in a year after Proxy and whatever other updates, but I can't worry about that too much.