The 505 is has few safety advantages. The G1000 cockpit. Autopilot option and with comes the level flight trigger on the cyclic that will probably save some lives in the future, it will enter autorotation for you if you do not respond fast enough and it glides like an fixed wing during auto, easy and forgiving to fly. The baggage compartment on the 505 is rather small but cabin is nice and good veiw from all seats.
MD530 is probably more fun to fly if the goal is aerobatics or tactical flying and looks better I agree.