There are a lot of laptops with good screens. When the return is not worth is highly dependent on individual tastes and needs. For a graphics pro spending an extra few thousand dollars may be worth it just for a slight increase in color accuracy and gamut. What is best is also subjective. Some want ultra high response time and refresh rates for gaming and will sacrifice color quality and accuracy. For others image quality is important or high resolutions.
I'd suggest taking a look at reviews on laptopmag.com. They cover quite a few models and gauge a few metrics in screen quality.
https://www.laptopmag.com/