I have a Bimare javelin 16 with carbon mast. In a storm the boat was torn from the ground anchor, flipped over to the side and hit with the chainplate my metal sailing box, leaving a dent in it, finally the tip of the mast was pushed into the ground by the wind pressure on the trampoline. The chainplate was bent, that was all. I have seen boats described as tanks, which had a folded mast after such an accident. I have seen similar with an A-cat and the mast (and the boat) survived as well.
People who tell stories about the fragility of those boats, never owned one. Of course it is not like a Wave or Dart 16, just like other glass or carbon sandwich boats. The decission is fairly easy, A-cat is lighter (75kg) and F16 (107kg-140kg) can sailed by two people, A-cat not. Both are fun, a spinnaker add more fun at light winds, but you can rig a spin on an A-cat fur fun sailing as well.

Cheers,

Klaus