I would not say I prefer the nr200. I like the ncase m1 overall. If the ncase could have taken the 3090 strix, I would have gladly kept it. I am only using NVMe drives, so all attached to the mobo. Both list the specs on 2.5 SSD's pretty well on there site:
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The original crowdfunded high performance small form-factor computer case. Designed by and for PC enthusiasts.
ncases.com
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The MasterBox NR200 takes all of the features found in a core performance ATX chassis and efficiently utilizes them in a space less than half the volume. Every feature is thoughtfully laid out in the 18-liter case to maximize component compatibility, ease of use, and thermal efficiency. Open...
www.coolermaster.com
IMO, in a SFF case, get NVMe so you can attach it to the motherboard, one less power cable, and one less data cable to worry about. It is worth the few bucks upgrade over a 2.5" drive.
Just know, if you get an ncase m1, there are length restrictions on the GPU. Depending on which version you get. The latest v 6.1 can take up to 322mm depending on thickness.
This is not an exhaustive list, focused primarily on current gen top-tier cards (as these tend to be the largest). Downrange models often share designs with higher end models, so this should still be useful for determining compatibility with many of those cards. Note that until verified by...
smallformfactor.net