I've given this (the original subject) some thought and came up with this FWIW:
I automatically elected to dive on both occasions as a climb or descent i.e. elevator input gives a direct instant vector change away from the path of the other a/c, whereas rudder and aileron input has a much significant lag before a significant vector change occurs. Also a change in pitch takes you instantly off of a collision course (if the other a/c maintains alt & heading), whereas a turn to avoid a collision may just prolong your life slightly if you turn away from the other a/c or shorten your life if you turn towards it. Therefore, I conclude that the best course of action in most cases would be a diving turn away from the traffic if in a low powered a/c and possibly a climbing turn away if in a powerful aerobatic type. But then of couse every situation is different
Makes me wonder why avoiding action is taught as a 60 deg bank angle level RH turn with simultaneous added power during the PPL (well thats what I was taught anyway!)