This is a good question, Tornado vs Big Bear, same motor? rear versus front, 10.4 ah versus 15 ah, 2x disc versus 1x disc 1x V brakes, no suspension seat post versus suspesion post, 24 speed versus 7 speed, non adjustable stem versus adjustable stem, no gaurds or rack versus both, 22kg versus 26 kg and 1,095 versus 849 gbp.
Thanks Hoppy, I forgot abouy the Tonaro.
If your knees are really bad and your hills are very steep ie. you can offer very little assist the Tonaro will out climb both of these with less effort from the rider but at a lower speed, with a throttle you can use it without pedalling as well.
They should all be a similar speed on the flat.