I ran a Dommie for about 4 years (the original kickstart + electric starter) and now have a late 'offridized' XT600E (18" rear wheel, road bits stripped down etc).
I green lane and do trials competitions on the XT, and it's much better off-road than the Dommie was - with a Pirelli Trials tyre it goes almost anywhere!
The Dommie however was a much better machine for paved roads, more power, responsive and more roady suspension.
So I'd say your choice is probably dependent on how much off-road you're doing. The cush drives by the way get completely knackered if put to regular serious use in the mud - I know, one of my wheels is shot after 2 years of use...
Hope that helps.