For myself, I would choose the G26 and the G19. I don't care that much for .40, and the G17 grip doesn't hit me right, because the hump in the backstrap is in an awkward spot.
If your affection for each of them is equal, though, the next step in the thought process might be to consider the needs of the recipients. If they strongly dislike .40 and you are fine with it, it might be a keeper. If they need a concealment pistol and you have other options, you could consider parting with the G26. IOW, look at the decision from all sides and it might help.