Apple Studio Display, and a Samsung 2K 24-inch, portrait, as my 'reference' screen, where I put things I need to refer to, while I'm working on the main display.
Text on MacOS looks rubbish on low-res displays. A 48" screen at 4K is only 92 pixels per inch.
(3x) iiyama 27" 5K [DisplayPort] on Mac Mini with eGPU.
(1x) Dell 27" 5K [Dual-cable Displayport] on Trashcan Mac Pro.
Both models are long discontinued. I got great deals on all of these, so have ended up with four true 5K displays (w/ the same LG panel Apple used) for not much money total
BenQ MA320U - I was hoping to get one of the new Asus 32" 6K displays but they weren't available when I replaced my 27" iMac with an M4 Pro mini earlier this year. I've been really happy with the display so far, but may upgrade to a 32" 6K display in the coming year when they become available.
Mac Pro 2013 uses an LG HDR WFHD 34" Display. Love the screen real estate it gives for Logic Pro (used solely for music production).
Mac mini M2 uses a Late-2014 5K 27" iMac screen. Gutted the iMac I've had since buying it, bought a $100AUS adapter to use the screen, found a YT link on how to do it all - saved myself $2500 on an ASD (also sold the internals for $100 so made my adapter money back). No speakers or camera, but I have external speakers and an iPhone with continuity for camera so no biggie. Was a good project to work on too.