If you are going to climb uphills I advice you to go for a mid drive motor electric bike. I owned a hub motor and they are fun on flat surfaces but not so much when it comes to climb.
Also an internal hub gear will save you lot of pain in terms of maintenance.

If you have budget go for gazelle.
If not go for ariel rider c-class. It is around $1700 and has mid motor, hydraulic and internal gear. Frame looks like Rad power tough.

For Rad power I heard their customer service is amazing and bikes are ok. I tried a rad rover 2 years ago so don't know much about rad city. For blix hmmmm. I rather pass them. Their e-bikes aren't that powerful.