In my horribly unscientific, biased opinion I prefer the 43X, which I have, over the FN which I'm completely unfamiliar with. And I could be wrong.
That’s a known concern with some of these pistols. Some break while dry firing. Others when firing. Look at the brass. If you see the primer indented then evidence of the striker still in contact with the primer during extraction there will be too much stress on the striker.I vote for the 43X, since I EDC a 48 MOS. I had a FN 509 and the firing pin broke just with dry firing with snap caps and laser bullet. The gun never got to the range and went back to the LGS. I lost confidence in FN. The gun did have nice ergonomics though.