Having owned all three and currently owning and using two of them I can offer the following.
The Wegner has great ergonomics and a bladeshape that seems to suit my types of uses. It does however suffer from only one liner, and a thin one at that, and, worse of all- it's a liner lock ... and athin one at that.
The 940 Osborne was my first axis lock. It is alo the one I do not own any longer. There was nothing really wrong with the knife except that it was not heavy duty enough for my tastes. It was light for its size, very useful bladeshape, great fit and finish and comfortable, both to carry and to use.
That brings us to the 710. Mine is in M2. The blade shape is not so great for field dressing and skinning as the Wegner, but I usually use fixed blades for those chores anyway. It is not as light and easy to carry as the 940 and not a sheeple friendly as the pretty little green knife. It is, however, a very useful bladeshape, comfortable, axis lock (did I mention it's NOT a liner lock?) and, IMO, more
"heavy duty" that the two abovementioned.
There is not a bad one in your bunch, but based upon the criteria you deemed important (I feel likewise) the 710 in M2 would be my choice. As a matter of fact,
it IS my choice.
I should also mention, that I am not a big fan of benchmade, the company. So, for me to give praise to one if its products says something!