From a safety stand point I would of course prefer to connect my leash to the flagging line and not the chicken loop, but on my first kite the ‘flagging ring’ was on a trailing edge line so it was positioned at end of the bar, and after crashing, the safety leash would regularly end up twisted around the chicken loop / centre lines etc. and it seemed to me that being in this situation could possibly lead to disaster? So then I’m in the water trying to figure out how to untwist myself while keeping control of the kite, or disconnect the leash from the flagging ring, untwist it from the chicken loop/centre lines, and then reconnect it to the flagging ring.

(Either situation being quite difficult for a noob) Once I had some 'decent' control of the kite, I then switched to connecting the leash to the chicken loop, to avoid the ‘twists’.
I’m using an IDS bar most of the time now, so no more dramas on that front, which is just fine with me.