Air is more complex running airlines, require more onboard equipment (valve, tank, lines, actuators) and are subject to leaks. You also need field equipment such as a pump or small compressor, and cost more.


Mechanical is cheaper but involves a bunch of linkage tinkering to get them down and locked and up and locked, though down and locked is arguably more important
Also if they jam and the servo stalls it could drain your reciever battery flat in no time. They don't leak though.

Air up, spring down are probably your best bet if you don't mind the investment.

Which Mustang?