I've had good luck with getting the upper tier of any NVMe... E.g., "Legend" for ADATA, or "Pro" for Samsung, "Black" for WD, etc.
But I gather that's because, as others have posted, those flagship devices have all the features such as cache...
First thing I thought of for the colors... VLAN number. But of course, 1) you'd have to memorize vlan & color combinations; and 2) some people have color blindness. :)
I have a friend with the Fractal North. Her experience has been it's a bit loud with factory config (air cooled), but I believe it can be made quiet with the right tweaks & fans. And yes, a video card bracket is required. :)
Also, I believe a...
It's interesting to see that I've been doing what most people have been doing. My main rig is 2 x NVMe only. Gaming rig is SSD only.
I only use HDD for the NAS and for offline backups (HDD docks work great for this purpose), due to the price...