Internal hammer for the reasons others have mentioned.
I strongly recommend carrying in some sort of pocket holster to protect the gun and to keep it from shifting around in the pocket. I like the DeSantis Nemesis.
If you are sold on the J-Frame, that's fine, but if you are not, you may want to look at the BodyGuard .380 and the KelTec PF9. If you like the M1911 you also might like the Sig P238.