highly recommend getting one with a motor from a reputable company with good support lest you be stuck with an ewaste bike. Bosch is number one, shimano is fine too. Avoid Specialized for sure, unreliable proprietary motors. Bigger Chinese companies like Bafang are fine but don't have the same kind of support, and there's a good chance you'd struggle to find a place locally that would service it.

Radpower for entry level, Trek if you want the high end. Plenty of options higher, lower and in between those too.