What i think i remember, back in the days Nauticam was the cheaper aluminium housing when it hit the market. Now 15 years later, it has become one of the more expensive ones.
I feel like Marelux is doing the same, offering aluminium housing cheaper than competition. (Disclaimer, i just checked some Blue Water prices).
That being said, i havent tried Marelux housing underwater, but i have compared side by side A7RV Nauti/Marelux. Couldnt say anything bad about either, some different choices have been made in design, but i probably wouldnt have any problem picking Marelux if i started this hobby now.
I just have been using Nauticam for 10+ years, and its hard to change with all ports ect hidden away from family 🤣