Evolution X is the best custom Rom for the Moto X4. This is in all better as Factory Firmware!
Pixel Experience is the Pure Pixel 4 experience for the Moto X4. And that without any extras.
Arrow OS is a simple but customizable Custom ROM based on Android 10.
crDroid is designed to increase performance and reliability over stock Android for your device also attempting to bringing many of the best features existent today.
Superior OS was the best custom rom and is still the second best custom rom for the Moto X4.
ION is very stable for the fact that Android 10 has not been on the market that long.
Havoc OS is very feature rich, and has a great performance on the Moto X4.
Derpfest is a feature-packed ROM, with many options for customization.
LineageOS is a ROM that has been around for a long time. It is one of the most stable and most frequently updated ROMs.
Android 10 ROMs require latest firmware