Performance-wise the SSUPD Meshlicious has MAXIMUM airflow perhaps at the expense of dust. It's not cheap.
I've heard the Cooler Master NR200 is easy to work with, has basically the same layout as the nCase M1, but cheaper than the M1 and has a bit more space so it's not as much of a struggle to cram things. The Cougar QBX has a similar layout, even cheaper, uses a lot of plastic to achieve lower price.
I own an nCase M1 which is too expensive to recommend, but the layout is something I CAN recommend. Just get a cheaper case using that layout because for ITX builds that layout "just works" and you don't need a PCI-E riser cable to do that layout.
I also own a Cougar QBX. There are some things I dislike about it, like the side bracket blocks too much airflow with the way it's designed, the 2.5" drive mount behind the motherboard can only fit the slimmest possible 2.5" drive, it has no motherboard standoffs instead it has these weird bumps punched into the steel, all that aside it's the cheapest means I've seen for getting a similar case layout to the nCase M1.
Lastly, I own a Sliger CL530. Like the M1 it is too expensive to recommend. There are many things I dislike about it, like it doesn't utilize the space very efficiently so you have gaps that don't benefit you much unless you have many extraneous cables to route, forces you to mount side fans in a specific way, can't access the back of the motherboard once installed (if you need to reach the back of the motherboard for nvme or cpu cooler installation, then you have to take out the entire fucking motherboard), front USB port setup is not optimal, PSU only exhausts INTO the case (there's a fan mount close to it, still a fucking stupid decision). There's a lot of dumb decisions in the design of this case, but the space makes it not the hard to work with and the layout makes it possible to have the case slim enough to slide into a backpack. The handle is also very nice, but costs extra.