No one should be using Chrome, Firefox is the way.
You could also check out CalyxOS, it has a few features that make it easier to switch and it tends to run considerably faster than graphene.
What about lineageOS? My gut feeling is that it’s an op but that is based on literally nothing
The big issue with lineage is a security risk due to having an unlocked bootloader. As I’m aware only graphene and calyx will allow you to re lock the bootloader, keeping your stuff significantly more secure.
Honestly could people stop naming alt OSs and say what they actually do. I’m intrigued, but nobody ever makes a real case for me to switch while informing me of the risks which would be really helpful. And there’s apparently a few choices, but I have no clue what the differences are.
All of these are derivates of the base android operating system. They are basically attempts to reconstruct functionality that is removed when you get rid of all of the google software from android. Several offer increased privacy, while others offer better security. r/degoogle has a fairly decent wiki on the topic, as well as r/privacy. The short version is that they are freely made products, and come with all of the risks associated with community and open source products, but can potentially have better security and privacy. The differences between the OSs are generally due to goals, some, like grapheneOS want to be as secure as possible, at the expense of other features. Some, like lineageOS are mostly about having an open source phone environment that is actually usable and friendly. To pick one you basically need to decide what you want out of installing a new is on your phone, and what you are willing to sacrifice for that.