Since I need to run a few apps that won’t work on LineageOS (because dumb developer security stance), I need to buy a “regular” android device that includes all the google “services”.
Ideally, it should be a cheap second-hand phone that will still receive security updates for a long time.
Are there bands that are better (well, “less worse”) than others from a privacy perspective?
Are there better brands?
Probably. I’ll echo the thoughts and opinions of others, sorry for the repeat.
Pixel phones will continue to receive updates (and GrapheneOS supports Pixels as long as Google supports them). If you go full tinfoil hat, you’ll see that there are people out there accusing Google of being an NSA partner and more.
Fairphone is a neat idea for reparability reasons. They also try to support their devices for a long time. But, they can be expensive for less than premium hardware.
Try to find devices that ship with very little bloatware:
If you really want to save, buy a broken phone and fix it. Rounded.com sells spare parts for different phones, so you could even find a phone for cheap and make it last using spare parts.