Depends massively on your budget, i would buy any 400ish dollar phone from any well known chinese brand (Redmi, Realme) and flash it with something like lineage OS, the hardware is good enough and will last a few years, if you have a higher budget, something like the asus zenfone is also good and you probably won’t need to modify the software (unless you want to)
Stay away from samsung imo, they are harder to mod and their budget phones are far from the best, they may look decent on paper but the software and speed are very lackluster