First off- I would not buy anything without being able to handle it in person myself. There's no need to panic and be desperate. Be patient, it's worth it.
That being said, my EDC is a 26. I like the smaller size as it is better overall for carry, for me and my needs.
People love the 19; but, you can "make" the 26 larger with a grip extension. You cannot make the 19 smaller.