I'd say take the one in better condition (play in the focus of the newer one doesn't sound good), and if you have 55mm filters, then that's as good a reason as any to take the older one. I have the later one, and it's an excellent lens.

There is an earlier 35/2.0 with a convex front element--super sharp, higher collector's value, better for B&W than color because the front element is prone to yellowing due to radioactivity, but that doesn't apply to either of the lenses you're looking at.