Can anyone say which interface they like most?
I think the answer is probably going to be different for every person!
Personally I like a dashcam that I never need to touch, but still keeps me informed of anything important - the voice notification on the Viofo cameras is very good.
Other people frequently complain about voice notification on other brands, saying that they talk too much.
Some people like voice commands for control of the camera, but then other people would never use them.
Some people prefer phone apps to inbuilt LCD screens, but then other people prefer the LCD screens.
Some people want to be able to upload videos direct to the police at the scene of the accident, while others would rather take the memory card home to their computer, and then take their time to decide what should go to the police.
Some people have the cameras for making road trip movies, others have them for recording accidents, others for recording/reporting dangerous driving.
Maybe we need to know what you will want to use it for, and what your preferred interfaces are - voice, keyboard, phone app?