The A-10 is much more "user friendly" than the Shark, once you get the hang of the computer systems the A-10 is quite easy to fly. Of course, it's underpowered, and with a full fuel and weapons load it feels like trying to fly a brick, but it still wont actively try to kill you, like I always felt the Shark was :P
The A-10 is easier to fly, but the computer systems are more advanced, the Shark is harder to fly, but the systems are very straight forward.