After many cases, I have a few things I look at now
1. Material used. I prefer Aluminum (Old Lian Li) or a mixture, like my Jonsbo U5.
2. Cooling setup. Are fans only at the front, rear and top? Can they be installed on the bottom for intake? Front or bottom intakes, are they unobstructed? The whole minimalist look NZXT and others do, with having just a little slit at the front for intake is BS, and should be banned worldwide.

3. Side window - Plexi or Glass? If plexi, why? Cost?
4. How panels are attached. Locks, slide on, or thumb screws
5. This is more of a personal preference, after having used Lian Li for so many years.
https://www.silverstonetek.com/techtalk_cont.php?tid=wh_chessis&area=usa
How is the rear fan (or top fan) grill configured? Why would you have 3 fans blow air INTO the case, but give the air tiny holes to be exhausted out of. Wire grill is almost totally open, I prefer that, or something close.