Screen resolution don’t matter much 1920x1080 is full HD and about as good as you can get, you have a 1920x1200 format and the big 2500*1500 on dell and apple 30”.
Basically you want as much as you can get and how much your graphic card can manage, the later might be an issue on a laptop.
Thanks for this feedback. I'm able to run the 4k textures in Oblivion, for example, without too much impact on frame rates, but I haven't tried anything else (only vanilla version or 4096x4096).
I suppose it's a subjective matter - would be interesting to try a 2048x2048 texture pack to see if it is noticeably worse. If not too bad, then I imagine it would be worth switching to get a boost in fps.