Fairphone is a good project but i have three reasons to prefer Pixel/Graphen.

Fairphones are big/chunky i like smaller one handed phones that fit well in pockets the pixel a series is alreddy on the big end for me, the form of the samsung s10e was peak.

The price value in pure hardware specs of pixels a series is just better.

Graphen > Lineage if you want to sandbox / emulate play services for certein games, banking apps, etc.