I recently made the switch from a G27 to a P239 myself.When I was looking for a concealed carry gun in.40 I chose the Sig P239 over the Glock 27 because after shooting both I found the Sig to have much less percieved recoil than the G27, also the P239 is more controllable in my opinion. However the mag capacity on the single stack P239 is much lower than the G27. As far as and open carry of truck gun is concerned I'd go with the Glock 22 all the way.
I just picked up a 4013TSW last weekend. I like the 3rd gen Smiths and am planning, after more quality range time, to work it into the carry rotation.I also used to have a smith and wesson 4013 tsw That I was pretty fond of.