We have a 500W 48V 12AH hub motor bike purchased from the Chinese manufacturer and I have a mtb frame based Trek commuter conversion with a BBSHD 48V14AH (1500W). The hub motor bike is perfectly capable of carrying people of your sizes anywhere you want to go. My bike is more "advanced" with more power, a need to be careful when switching gears under high load (even with the gear sensor), and more potential speed.

Both bikes will go about 40 miles on a charge if the person is making an honest effort to pedal along. Both will still motor along with the throttle at 10-15 mph and perhaps last 15 miles - the BBSHD even with me - a big bear of a guy on it.

My bike was $1500 to build. The Chinese bike was about $1200 to buy prior to the tariffs. Both have their charms, both have their rough details. I prefer mine though. The hub motor bike is really nice at very low speeds/low loads b/c there is no slop in the drivetrain (no chain or freewheel to protect from sudden jerk throttle movements).