Color rendition matters more than it being 4K.
Assuming you're using LR and then PS afterwards, go with one that has a decent sized monitor (at least 15 inches, up to 17 inches if you can manage) and runs off a SSD.
If you edit more at home, the money is better spent on a desktop.
There's really no advantage to having a 4k monitor unless you're shooting with at least a 36-48+MP camera with super-sharp lenses to go with the set-up.
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