Aren't Chromebook really cheap 'laptops' with low specifications? You will need to provide more details like your budget and which laptops you were thinking to buy. There are many different 'Dell' laptops with different specs and price tags.
Maplestory won't run on a Chromebook. Chromebook uses Google Chrome OS (Linux based operating system) and Maplestory only runs on Windows. Even if you are able to install Crouton and Ubuntu on the Chromebook, most Chromebooks don't have a powerful enough CPU to run a virtual machine.
I've added crouton to it and put a Linux Distro then VMed it. The problem is most Chromebooks come with 2~4GB ram, and 16GB - 32GB SSD space, which would barely be enough to run it. Mine was 4GB and 16GB. You can, but I discourage it. VMing is really laggy unless you have a lot of resources to use.
Go with low-end laptop. If it has an alright processor and 8gb RAM, it should be enough. Even if it has 4GB, you can buy the memory separately and add it in yourself.