I have both in 9mm. Bought the Shield thinking that my employer was going to authorize it as a BUG - they haven't managed to. I carry the 9c as a BUG instead. The Shield has a slightly shorter barrel so it's shorter overall. It is also noticeable thinner than the 9c. it also a bit lighter. The Shield may be all the CCW pistol many folks really need. I prefer the utility and capacity of the 9c as a primary off duty, and will probably still carry it in retirement in a few years. The Shield will then be my BUG and also fill the role when activity or dress even makes the 9c hard to conceal.