What s the best laptop for designers?

as everyone here, it depends on your budget.

for the best experience you should be looking for:

Fast Rendering -4 core (or more) processor like an i7
Large file handling -16gb of ram (or more, you could buy one with 8gb and upgrade it to 16 often it’s cheaper then upgrade by manufacture directly)
Fast model navigation and procedural rendering -Dedicated graphics card like an Nvida or AMD (Nvidia has better compatibility)
UI and Accurate color Visualization -A good quality monitor screen with at least 1080px resolution (best use of the UI and accurate visualization of the model and colors)

The brands i recommend because of it’s price and quality are Toshiba, Dell (look for the XPS line) and Lenovo (look for the Y series)

Generally any Gaming laptops would work, you could also look for the workstations line of laptops but those are much more expensive, also the HDD can be upgraded to an SSD to noticeably improve the computer response to open the OS, files and applications, some laptops already come with an SSD. Stay away for the very cheap ones (like HP and Gateway) those won’t offer a good quality.