Lineage oder calyx?

I'm looking for an OS for the Xiaomi Redmi Note 13. Also for a Pixel 9.

I can't find anything for the Xiaomi. Can that be true? For the Pixel, I'd like to use Lineage or Calyx. Will that work?

I'm going to flash a smartphone for the first time. That's why I'd like to practice with the Xiaomi. If that works well, I'd try it with the Pixel.

Is there a recommendation as to which OS is easier to install?

Graphen would probably be too technical for me. Is Onyx less restrictive?