GNU/Linux on Phones are far from Android, but we slowly getting there. So if you want a better experience, just buy a phone that can run a community Android distribution like LineageOS.
But if you are an advanced user and really want to use GNU/Linux on your phone, then I would recommend buying a PinePhone Pro + Pine keyboard (there is a bundle on their website). The keyboard is needed because it extends the battery life (without it the battery life is horrible) and compensates good swipe touch keyboard typing (we currently don’t have a touch keyboard with swipe feature). I daily drive this phone on ArchLinux with Plasma Mobile and I satisfied with the result.