I would recommend fold. Bigger screen for everything. I used to flash roms daily but got to the point that I was flashing roms and not really using the phone much. Samsung with good lock and routines has made flashing and rooting unnecessary. Also Tasker and macrodroid for some stuff...

The best phone I have ever used is sonyericsson p910i It was years ahead of it game. Best form factor, came with a pen, removable keyboard, SD card, and so on...