Depends on what you want to do. If you need CUDA for certain applications in example, its better to use Nvidia. Do you have a G-Sync monitor? Nvidia. Currently Nvidia does not work well with Wayland, if you want to game. Nvidia is also better at Raytracing, if that is something important to you. The Open Source Kernel modules for Nvidia doesn’t matter at all, because the driver is still closed source and basically nothing changes. I believe HDMI is better supported for Nvidia, because of the closed source driver. HDMI does not like Open Source and therefore its a bit limited on AMD. I would recommend using DisplayPort anyway, but that might not be an option for every monitor.
Also in my experience it was a pain to use Nvidia, not only because of problems here and there (under X11 back then), but also because drivers were downloaded multiple versions in Flatpak. Because each program was depending on a certain version of the Nvidia driver. Each of the drivers were over 300 MB downloads, so it adds up after 6 versions and updating over and over again.
I don’t know what the current state of Nvidia is to be honest, because i switched to AMD. So it comes down to what card is available to you at what price, and what you want do. If you don’t know and have to ask, I would say AMD is a safe bet. Buy into Nvidia only after research and if you really need certain stuff.