DDU 1st is always better for a clean removal.
I you use custom bioses, don't forget to patch the 18.3.4 driver before the reboot.
Drivers 18.x.x don't need patch. AMD removed check mod bios. I'm use RX 580 8Gb and didn't patch drivers from 17.12.x when AMD was removed mod bios protection... All my 580 cards use modded bioses.