Fred. If you plan to take on some steep hills it might be an idea to look at a bike with the Bosch Performance CX motor such as the Cube Kathmandu Hybrid Pro 500 or the Haibike SDuro Trekking 3.0.
The other Cube bikes you mention have the Bosch Active Plus motor which has less torque - which might be needed to get up the hills.
I would find a local bike shop that lets you test ride the bikes and take them to the steepest local hills....
The CX will get you up steeper hills but it's not zero resist, so you are not going to get the insane range on relaxed tours the ALP will give you.
The ALP with total weight of 125kg got me up Werneth Low (which tops out at 14% I think) whilst dropping my heart rate down from 160 to 150, so unless you are incredibly heavy, unfit/infirm or tackling monster inclines you won't need the CX.
And if you use the Cube Touring as it's designed, you can get insane real world range out of it.
I used it for a tour up to the Longendale Trail this weekend. Two and a half hours, 36km and 2000 feet of elevation and it didn't budge the battery down from 5 bars.
It finally dropped to 80% about halfway into my 20km commute this morning (when I'm flogging along more or less on permanent 100% boost in Tour mode).
The real world difference zero resist makes is hard to underestimate. You can use a Cube Touring as just a well built if heavy normal touring bike and only call on the motor when you want a speed boost, or to help on a hill or into a headwind or on a heavy surface, or when you are tired or you want to drop your heart rate. Used like that you can explore more or less anywhere all day with no range anxiety....