You only mention your laptop is running out of space so you need to get a new computer? does your laptop have a soldered SSD? If that’s not the case, I think the reflex should first be to see what storage you can get your laptop so that you can keep using it rather than discarding it :(
I think the only thing to keep in mind is that Nvidias proprietary drivers work better for Linux whereas for AMD it is the open-source ones.
I have an Nvidia card and the prop. drivers have worked flawlessly for me for years.
I know the open source drivers are closing the gap for Nvidia, and they also seem to be playing ball on that front. But for AMD the open source drivers are definitely the way to go from what I understand.