Eight years ago, after some looking at a few different housings, I went with Subal. I preferred the controls and also how well everything works...every time.
And then six years ago, when I updated to a 5D, I looked around a bit again and again went with the Subal. I've been very happy with it. My only gripe with it, like many people, is that you have to very careful with the port accidentally turning. That takes constant vigilance, especially when the dome port. Beyond that, it's been a solid system that has worked on every single dive. The main housing that I've seen people have problems with are Ikelites; a lot of people that I see with Ikelites seem to have some little trouble here and there, but then I am not sure what their care and maintenance is like either.
If I were to update at this point, I'd look around again at all the housings, but that would mainly be for pricing, rather than performance. And I would be influenced both by my experiences and also by the fact that I already have all the Subal ports.
I will add that I have seen the Nauticam in person, but not had it in my hands and played with it.
Overall, I think there are so many great housings out there and, between the higher end housings, I think some of the decision is comfort and ergonomics.
Best of luck to you.