G26, period.
I'm not a .40 fan at all, but I usually don't mind shooting them, but .40 in a subcompact just sucks, even expert shooter's skills suffer shooting G27's from what I've noticed whether or not they'll admit it, timers don't lie (might explain why finding used G27's is easy, not so much with G26's).
Really, all caliber talk aside, practice is really the issue, and having shot all of the above, the 26 is really the only one that's fun to shoot and that you'll probably shoot enough to run advanced drills and such without wanting to switch to something else before you really have your work in.
A G29 is big compared to the other two as was mentioned, but 10mm is another caliber, especially in a compact, that gets bragged about a lot and practiced with too little.
I prefer the G26 to a G19 for EDC as it's lighter and smaller but still close in size, IMO if you can hide a 19 why not just carry a G17 then.
I transitioned to AIWB carry for EDC (about 1 o'clock to 2 o'clock) a while back and recommend giving it a try if you haven't before (another reason why I like the shorter gun), the 26's weak point is it's still thick as any other Glock, but AIWB it hardly prints and I never get made, lately I've been using a $20 Blade-Tech Phantom set to straight-drop and it's as good as a $180 High Noon I own, so don't let finding the right holster to try it hold you back.
As far as being like a Taurus 709, once you own a Baby Glock (and once your 709 starts acting like a Taurus) you'll find out that not being like the Taurus is a good thing. No offense, but you can take a G26 to war I wouldn't take a 709 to Detroit and I'd almost rather have a good knife than a iffy Taurus that may f'up and get me killed.