i own both
I have had the 9c almost a year and I love it.
best score in IDPA was with this one, better than with an XDm with 5.25 barrel and adjustable sights.
I have only had the shield a couple of weeks but it is different.
Trigger and grip are not alot different but noticeable.
The shield does conceal better, it is more comfortable at 5 o'clock when riding.
So for me, it's 9c in winter dress and shield in summer.
Very happy with both.
Evil cannot be reduced thru Legislation!