GrapheneOS is the best android custom ROM by far. It is more secure, it gets updated very often and security patches land on my phone faster than I hear about them. It is way more performant than the default ROM that ships with Pixel Phones, my battery lasts for days if I don't use the phone.
At first I was very sceptical, as I want to be sure I can rely on my phone. But it is super stable, way better than the Samsung ROM I had before.