I’ve used both and prefer the Matrixarchate. The Doepfer A-150-8 definitely blurs video signals more than the Matrixarchate but is fine up until a bit farther above V sync / audio range–it’s much less of a smear than other audio modules I’ve tried. I think it uses a DG409 for the switcher IC.
The switches operate into audio range so you can get scrolling horizontal bars between inputs. You might need a scaler to hit the switches’ voltage thresholds. The immediacy of programming multiple switches to actuate with one trigger with persistent memory and no need to save its configuration with a button combo is nice. Its layout felt more immediately playable out of the two.
Matrixarchate perceptibly blurs detailed external video by a couple of SD pixels so don’t expect to switch crystal clear portraits with it. It works perfectly fine for slightly less detailed SD images or lower frequency content still within H sync range down to DC. Beyond its better image fidelity, where it really shines is its doubled amount of inputs (these are bidirectional so can be outputs just like on the Doepfer A-150-8) and you can sequence completely different complex routings instantly without complex logic signals.
It uses a MT8816 for the switcher IC. You might need a scaler to use its Trigger input but I’ve had success with V sync square waves out of Prismatic Ray. It only responds up to somewhat low audio rates but you can get scrolling horizontal bars. Its button interface is okay but doesn’t feel quite as intuitive as the Doepfer A-150-8–there are a couple of function+button combos to remember.
If your goal is being able to reroute one physical patch with as much variety as possible, would definitely opt for the Matrixarchate.
It also speaks I2C so there are some interesting possibilities for dynamically accessing its matrix. Particularly curious if anyone can work out how to get Befaco VCMC’s I2C firmware talking to it. Mapping the faders and buttons to set/reset crosspoints for generative routing under voltage control would be fun.