[Galaxy Note 4 Accessories] JustSomeRandomGuy:
Based on this thread I decided to try a bunch of different cases. I had mixed results. Here are my findings. All of these were used with an unmodded Samsung wireless charging cover.

Supcase Unicorn Beetle Pro

This case fit very well once you rip off the included screen protector. This was the only 2-part case that I felt fit properly. The case is MASSIVE though and its chunkiness gave me confidence that it would protect the phone in a fall. But it was miserable trying to pocket the phone with the case. I was worried that the Qi charging would work given how thick the case is, but I can confirm that my TechMatte pad, RAVpower pad, and RAVpower angled stand all worked, so that was a plus. I had no trouble accessing the S-pen.

The power and volume buttons are covered by the case, but I didn’t have any problems with alignment. The case material does cause resistance when you try to press a button, but it was never a problem. This might even be a benefit if you find the buttons too easy to press. There is a very deep lip to protect the screen from a face-first fall. This is my second favorite case.

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Caseology Bumper Frame

This simply did not work for me. The volume and power buttons were always slightly pressed and would randomly activate. The S-Pen was blocked by the plastic frame. Finally, the case didn't provide very much of a lip to protect the screen. I really disliked this case.

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Caseology Dual Layer

This case worked a little better than the Caseology Bumper Frame, but not by much. There is more of a lip for screen protection and the S-Pen has plenty of clearance. However he volume and power buttons are covered and I felt that there was a lot of pressure on them. Additionally the hard back bowed out in a strange way that looked like it was under a lot of stress.

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Joto Armor Case

The Joto Armor case fit ok. The S-Pen was unobstructed. I had to adjust the side with the power button otherwise I couldn’t really press it. The volume buttons were easy to push though. Unfortunately, the hard back of the case bowed out like the Caseology Dual Layer case. Worse, there was virtually no lip to protect the screen.

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Caseology Drop Potection TPU Case

This is the case that I’m going to stick with. It fits about just shy of perfect and has plenty of lip to protect the screen. The volume and power buttons are uncovered, so there are no issues with them being pressed due to the stress on the case. The S-pen slides out without any obstructions. The case is also slim enough to easily put in my pocket. Finally, the texture provides enough grip for one handed use without being sticky or tacky.

As for downsides all I have are minor quibbles. The case is shiny instead of matte and it attracts fingerprints and smears. The fit on the bottom by the home button doesn’t quite reach over to grab the front of the phone for a perfect fit, but it still has plenty of lip to protect the screen. I don’t know how much protection this case will actually provide in a fall, but for general protection sliding the phone onto my desk, shoving into a cup holder, or tossing into a bag, it does a fine job.

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I'm guessing most TPU cases will fit fine as well, but I'm good with the Caseology case at this point. Hopefully this helps someone a bit.