YMMV, but I'd get the Cube reaction hybrid for certain. Solid bike, motor with plenty of power to tackle ANY hill and the 500wh battery is really the deal clincher. You've ticked all the main boxes there. Most of the other options you quoted had to make some compromise somewhere. That cube doesn't.
One could say I have a bias, as my main commuting bike is actually an older model reaction hybrid to which I've added a rear rack and bag with fold out panniers, and a front mudguard. The latter being VERY
cheap and easy to fit (attaches up into the crown (?) of the suspension fork where there is a large opening), and the former meaning you don't actually need a rear mudguard!
I put fat, but non mountain bike wheels on it, and the comfort is far superior for gravel and trails etc than a normal hybrid, and the slight extra weight that you pay for it being a proper mountain bike becomes irrelevant when you have a motor.
But bias is probably the wrong term, because if something happened to my Cube and I had to go looking for another bike of the same type to replace it ... I'd probably just end up coming to the same conclusion than another reaction hybrid would be one of the best options to go for, even if I was using it for general purpose use and not as a pure MTB.
I think the main reason NOT to go for the cube would just be if one was going to use it exclusively on good condition roads, and you really disliked the more chunky look of an MTB.