If I might make a suggestion.
Have a private chat to georgehenry. His bike requirements are seemingly fairly similar to that of your own, and I believe that he has been using both crank drive and hub drive. This is one of his bikes, and the thread makes for very interesting unbiased reading.
@georgehenry
http://www.pedelecs.co.uk/forum/threads/haibike-sduro-hardseven-sl-2015-yamaha-7-month-1600-miles.22644/
I'm a passionate fan of hardtails, but will openly concede that with this dry weather, I have been enjoying the off road comfort that full suspension brings.
Whether it is worth it for about four months of the year when full advantage can be taken of the suspension I'm tempted to say not for my use, but everyone has different requirements.
I strongly suggest that you try both before making any firm decision, and that includes both crank drive and hub drive.
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