For me the issue with carrying concealed is more about grip length than slide length. The slide disappears down my pants (what she said). The grip sticks up above and is what people can see. I go back and forth between a G43 (short grip) and G48 (long grip). The G48 is as easily to shoot accurately as a G19, but is way thinner and way easier to hide. The G43x has a shorter sight radius but the same grip.
But I should say I've only handled, not shot, a G43x.