Whatever you do, 1920x1080 is going to look blocky on a 27-32" display after a 24" 1920x1200, unless you are looking for a larger screen so you can move it further away.
Personally, I'd stick with the dual 1920x1200 until/unless you want to go to 4k. Otherwise, at least go to 2560x1440.
For 4k, I really like the Huawei Mateview as a Mac display (unfortunately, they're hard to get in the US for reasons that belong in another forum) and may be out of your price range - it's a 4k+ 28.2" display with 3840 x 2560 resolution - essentially its the same width and pixel density as a 27" 4k but with another couple of inches of space tacked on the bottom. You can either run it with non-integer scaling to get massive real estate, or use 2:1 scaling ("looks like 1920x1280" - but it really doesn't) to get a 4k-sharp image without scaling artefacts (so your 1920x1080 video will display fine). On a regular 27" 4k, 2:1 scaling makes everything a bit large and you lose space to the menu , toolbars, dock etc. - leading to compromises with non-integer scaling - but I personaly find the extra 2" of vertical space on the mateview makes up for that. (Note that, however, on a Mini, you'll either have to use a DisplayPort to USB-C or put up with 50Hz refresh via HDMI).
People have been blaming this on Apple's disabling of "Sub-pixel anti-aliasing".
The flip side of that is that while, when SPAA worked it was really good, but when it failed (e.g. display runs in ycbr mode rather than RGB, or has a non-standard sub-pixel layout like OLED) it looked horrible - I've had a few displays that suffered from that. Every display manufacturer tests their displays on Windows, few test them on Macs...
However, OP is currently using a 1920x1200 display on a M1, so they're already seen the effects of no SPAA.