We are purchasing a 18 year old AQHA that has been a beginning show/trail horse for a couple of kids prior to us. He seems well trained and fairly soft in the mouth. One of my daughters is a fairly good rider and has pretty soft hands. The other one is younger and doesn't yet have the finesse. Does anyone have a suggestion of what kind of bit/bridle I should use when the younger one rides so that we keep this horse soft and non-irratitated? He currently rides in a myler bit for English and some sort of a ported bit for western.