I can tell you a bit from my experience. I hope I'm not too boring. Since it's me, not you we're talking about. But maybe you can learn from my story.
I'm an early adopter and advocate for Jeff and his products, back to Genz-Benz days.
I was an early adopter of the Streamliner, and had Uber cabs with that.
When Jeff started Genzler Amp, I had to have the Mag800 when it first came out, at first paired with a single 12-3 (there were only straight at the time).
I've always been of the mind that you need at least 2 cabs for the best sound. 1 is OK for my upright rig, but with electric, I always seem to want at least 2 of something.
Then, I found a local guy on TB that was selling two 12-3 cabs, so I ended up with 3.
I didn't really need 3, but I did play that stack at one outdoor gig, and it was fantastic sounding.
If you consistently have room in your vehicle of choice, 3 cabs is a pretty cool thing (2.67 ohms).
Fast forward to my joining a Zeppelin tribute band, and I though I'd better get something a bit more RNR looking and sounding, so I opted to sell 2 of my 12-3s, and get the 410-3. Putting the single 12-3 on top of that for my big rig/outdoor rig.
Along the way, I experimented with a single 15-3 for country (more round bottom to my P bass), which it is great for, but that band did not survive Covid, so since 2023 I've had the 2 cabs in my life. 12-3 and 410-3, and I'm very content for the band situations I get involved in.
I don't know what music you are playing. that would make a difference (to me) on what to recommend.
having 2 10s is a nice small stack, perfect for small rooms. If I was playing a lot of outdoor gigs, I'd want more speaker surface area, regardless of which head is pushing it. That's the advantage (IMO and IME) of 12s over 10s. having said that, Jeff's 4-10 is a great cab. Again, surface area and bang-for-buck, being the key thing there.
Hope that helps narrow down your choices, but as many have said many times on here, it's hard to go wrong as long as it has the Genzler name on it.