Personally, my e-scooter is smaller and less "complicated" than my e-bike. No pedals or gears means less to maintain and worry about failing. It's easier to fold and stuff in my car.
But my e-bike is more stable around bumpy roads or potholes. I feel I'm more visible while riding it in heavy traffic, so it's usually what I grab.
A cross between the two would be interesting for me.