You can choose how much help you want from the motor and you normally go faster with a ebike (using a bit less muscle power).
I shaved a few kilos off my weight by using an ebike for a few months.
If you like your bike commute and don't mind getting sweaty you might prefer a normal bike.
No, I still expend enough power to keep my heart rate at ~160bpm during my ride, but now I cut my commute time in half and I ride more than twice as often.
If you like your bike commute and don't mind getting sweaty you might prefer a normal bike.