You are really looking at a lot of options blade and size wise. Both locks are now being offered on a number of models, with more to come from Spy(!) next year, so let your preferences in size, blade style and handle materiel be your guide.
I am still waiting on the BM720 to try the Axis myself. My impression of the REKAT offerings is that they are heavy, tough knives designed not to let you down. They are by no means a pocket knife, but the Pioneer is a good solid hand tool. The Carnivour is just a big, nasty piece of work, if that what you are looking for.
I will reserve judgement on the locking mechanisms until time and use have been factored in.
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~James