When I was deciding between the Model 227 and 227 Carry, I handled them both extensively and the choice was a hard one to make. Previously, I had opted for the Carry version of the Model 220 and, though I was never disappointed with it, I came to question the relevancy of the very slightly shorter barrel. I don't think it conceals any better nor do I think there's much difference in the handling of the two pistols. I arrived at the same conclusion when debating between the Model 227 and its slightly abbreviated brother, the Carry. The longer pistol rides comfortably and well-concealed in my Galco, iwb "King Tuk" holster.
All that said, you can't go wrong with either variant, just individual preferences and reasons.