The Glock 19 is the jewel of the whole Glock lineup in my opinion, as well as the opinion of lots of other shooters. Handle and hopefully rent each one to see which feels better and shoots better for you.
We are all different. For me, the Glock 26 is a little brick which I don't like to either handle or shoot. Others love it so only you can decide on the G26.
Good luck with your choice.