15
Alienware AW420K or Razer BlackWidow V3
(lemmy.ml)
The official Lemmy community for the OpenRGB project.
Official website: https://openrgb.org
GitLab: https://gitlab.com/CalcProgrammer1/OpenRGB
I wouldn't get either. If you are going to use Arch, you should be an adult. RGB is for children.
In all seriousness, you don't spend most of your time looking at your keyboard, you spend most of your time touching it. If you haven't already, get a keyswitch tester so you know what switch feels the best to you.