I read through this and am not sure what your primary and secondary uses are.
I have owned the G26, 19, 17 and the Shield. Carried the 19, 26 and Shield.
If your ONLY use will be carry, then the slim Shield is a good choice, as well as the Glock 26. I had the Shield and was not satisfied with the low number of rounds carried (and could never stuff in the last round in either the standard or extended mags). So, I went back to the G26 and am glad I did. I have found it no less concealable than the Shield...and I am not a big guy.
*I* found that you really need a good holster for either the Shield or the G26. Weight is about the same. SO....if in a good holster...the choice is G26. Better gun, more capacity, longer barrel and sight radius....more accurate (in my hands).
For you, I would recommend the G26. It has greater capacity and incredible flexibility as a arm. It is comfortable and accurate at the range, and the array of accessories for it are amazing.
IF.....you have an equal desire to have this gun serve are your primary HOME defense weapon as well, AND a range gun, and only want ONE gun, then the G19 would be a better choice. It has a rail for a light and can be accurized for bulls eye shooting at the range.
All in all, I would go for the G26. And if you want a HD and range gun, get an additional weapon.
Hope this helps
Best
J