You won't be using the Laptop's screen for any kind of critical viewing anyway, so get whichever you prefer.
Well I plan to. I'm not a professional film maker, so I don't really have the money for an external high-end monitor. So from your response, I assume I should go with the highest gamut possible?
You don't need a professional high end external monitor, you just need a properly calibrated TV and a way to get the signal off the computer and onto that TV (like hardware from Blackmagic and AJA, or at least a Blu-ray player for exported video).
You can't do color corrections and grading using your Laptop screen for quality control. For starters, PP is not designed to show you the signal accurately on the monitors. But you also have the OS and the graphics driver which affect the signal. And finally, most computer screens simply don't calibrate correctly.
So again, it won't matter which screen you get because you can't use it for CC/grading work, the first step of which is to make sure you're seeing the signal accurately. That's just not something you can do with a Laptop screen.