Which ever one you like best. I have both and a G43. My wife liked the Shield the best and took it (after I put Trijicon HD's and an APEX trigger in it). When I carry a small gun, it's usually the G43 now. But, I still carry a G19 90% of the time.
That's like me ... Glock 17 the vast majority of the time, and occasionally the Glock 43. Examples of when I'd carry the 43 were like a couple of weeks ago when I had to take my dog to the vet. Lots of bending down or sitting on the floor to help the techs and the vet handle my dog.
