I like them both very much. Completely different approach to the simulation, obviously, but as for representation of the actual a/c, A2A is the winner (mind you I have paid same amount of money for this single add-on as for whole Cliffs of Dover), but as for combat aircraft - you know what I mean
They both feel alright, quite similar in fact. Like a Spitfire. Early one. Lovely stuff.
I disagree with the terrain though - unless you buy and install some 3rd party stuff (OrbX), the FSX world looks quite awful. CloD is much better, but obviously represents smaller area.
I was wondering about one particular detail in both sims - Boost to RPM relation is slightly different and I was wondering which one is closer to the real thing. I'd say that in this particular case, 1C got it better than a2a.