Get the 19.
The difference in size is small enough so that you'll never notice it while shooting. You will, however, notice it if you need to carry the gun concealed.
I have both the 19 and 26. The 26 is 10 years old, and the 19 is 6 months old. Now that I have the 19, the 26 spends a lot more time in the safe. However, if legal or economic circumstances ever limited me to one gun, the 26 is it.