I have a G19, and I bought a G26 a few months ago. The G19 is a GREAT all around gun, and the G26 is a GREAT carry gun.
As others have mentioned, the grip angle on the two is very different. The G19 has a large grip angle that I couldn't quite get used to. If you are used to guns that have a small grip angle like a 1911, you might not want this gun.
The G26 is the WORST feeling gun I've every held. It feels like a rock in my hand. However, it's small size, light weight, high capacity, indestructable finish, and utter reliability make it a GREAT carry gun. It has a much smaller grip angle, and that makes it easier to shoot for me. I also find it's reduced size makes it much easier to conceal. (I live in South Florida)
Definitely give both a test drive before you buy. Two VERY different guns...