If your CC, I'd say the shield. Glocks are big to me, in my opinion, they are large and heavy, some (the guy that's been carrying one for 20 years) may vehemently disagree.
The police cannot protect the citizen at this stage of our development, and they cannot even protect themselves in many cases. It is up to the private citizen to protect himself and his family, and this is not only acceptable, but mandatory. - Col. Jeff Cooper.