I would get the 4k for macOS, because fonts should look much better.
4K is great if you're doing a 2:1 scaling, such as a 1080p effective resolution. Thats fine for 24", but too big for 27" monitors IMHO, they are much better suited to 1440p (QHD). Doing 1440p equivalent on a 4K display is a 1.5x scaling and can be not as good due to interpolations and the non-integer scaling.
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What is a good 27" monitor for the 13"?
The LG Ultrafine looks nice, but is too $$$. I think 1440 would be a nice resolution on a 27". Any recommendations or is the Ultrafine the only good option?
IMHO 1440p (QHD) is the best for 27" -- which is why the 5K 27" is so good, you get the true 2:1 scaling.
It's also way more $$$ than I wish to spend.
Dell's Ultrasharp monitors have generally been very good over the years. I've asked about the U2719DC USBC monitor with power-delivery which looks nice, but so far no feedback. Seems to be really new. See
https://forums.macrumors.com/threads/anyone-try-the-dell-u2719dc-monitor.2146485/
They also have a less expensive conventional monitor. Careful with the non-Ultrasharp monitors, they switch to TN displays on some of the consumer level rather than IPS (which is what you want, or similar tech)
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I got the LG 27UK850-W the other day. It's gorgeous because it has very good color and multiple ports
How is it at QHD /1440p scaling? IMHO 1080p equivalent is too big at 27" diagonal.