6 Speed vs 10 Speed for Off roading

I?m in the market for a new Ranger and researching the benefit of going with the tried and tested 3.2l 6 speed auto vs the new soon to be released 2l bi turbo 10 speed auto. The price addition of $1200 is not significant enough to be the deciding factor. I do not plan frequent towing but will be off roading rather more often on a variety of surfaces ranging from gravel and sand to rocky. This will of course be mixed in with frequent freeway and city driving. 

I am interested in any opinions out there on the capability of a 10 speed transmission (or perceived capability given it is not available for testing yet!) off road as most tests done thus far on such transmissions (Ford F150) have been on tarmac or towing focused. A concern is the possibility of gear hunting with the larger number of gears on surfaces that transition from low to high traction constantly such as going from sand to gravel or rock. Thanks!