I will primarily use the laptop for just the scanning work, the rest of the work, and even slicing for printing will be done on my iMac,
and the slicing for me takes seconds, Cura is good and fast
I have used scanned data (180mb) and sliced within a minute or two.

While doing research I found that one of the important things is to be able to extend the screen to the scanner itself,
most will do that, but somewhere there was mentioned you need a dedicated graphics card where the scanner should be plugged in ?

I am a Mac man, but for the sake of ease of use it's probably better to use a Win dedicated laptop, even if a Mac with Parallels seems to work.