Im thinking D2 as my S30V is a bear to sharpen and S90V can only be worse with so many more carbides. On the other hand I do eventually get D2 dull and the S30V seems to hold its edge much longer. Your choice, but if I was away from civilization (and my lansky) more often I would choose D2.
The D2 should hold a excellent edge that will pop back after use with little help with little work, not so with S90V.
The only other thing I can think of is saltwater and price. If you work near, with, or in an ocean you might want to consider something else besides D2. As for price, I dont know, I am a southpaw and dont really care for the Military design.