I’ve had my mind on a google pixel (one of the used variety) for GrapheneOS but then i heard about Fairphones and I’m not sure which is preferable or if there’s any other options.
I can really recommend the Fairphone 3/4/5 with eOS, using them for more then 7 years now. The hardware is slightly more expensive due to their mission (fair traded minerals, sustainability, reparability). They are very good as second hand devices because of the cheap spare parts. eOS does everything you need, including banking apps.
unexposedhazard@discuss.tchncs.de 9 hours ago
So there is a bit of a situation going on rn…
Google is going evil mode on locking down android devices to disallow sideloading. I think its fair to assume that this might end up also affecting bootloader unlocking for future pixel devices and even future firmware versions for older devices.
That being said i would generally not recommend pixels anyways because they are just not very repairable. Not having a swappable battery or even an SD card slot is just a hard blocker for me.
Fairphones are not cheap but also not super expensive, if bought used, so if thats an option for you then i would go for that. A used FP5 goes for ~400€ or less if you get lucky. The FP6 just came out so the 5 dropped in price.
In terms of OS, only pixels support GrapheneOS but i assume you knew that already. The Fairphones are supported by LineageOS, e/os, Ubuntu Touch and more. Until recently i would have recommended CalyxOS but the development on that has been paused until further notice so its not a good idea.
Hope that answered some of your questions :)