See if you can try one out in person! There is a big difference in a wheel based motor and a mid drive one.

If you live in a hilly terrain, spring for a mid drive motor.The wheel based ones are less expensive, but they feel a bit like you’re spinning your wheels- less responsive to your actual pedals.

I think a lot of people have never felt what a mid drive feels like and they have no idea what they are missing. A mid drive based motor in a hilly area is like the push from your Grandpa to give you wings. I personally love my Bosch powered E cruiser! One of my very favorite things.