Conventional wisdom usually says that taildraggers should be tied down tail into wind and ailerons/rudder locked neutral, elevator locked in the 'down' position. Nosewheelers tied down facing the wind with all the controls locked neutral, or elevator 'down'.
The above is ideal, If you know what the wind direction is going to be. The fact is that it's more important to make sure that the tie downs are secure, sufficient in number, (wings and tail for a taildragger/wings, tail and nosewheel for a nosewheeler) and strong enough to withstand a force at least equal to the weight of the aircraft.
External control locks are better than internal ones.
MJ
