The P226 is slightly longer on both the barrel and the handle. The P229 is a little bit "top heavy" whereas the 226 is better balanced imo. The P226 works with my hands a lot better than the p229, hence, I picked up the 226. That said, I probably would have gone with the 229 if it worked better with my hands.
I have p229 and love it, i've held the 226 and it's just way to big. i say go with the p229, or with the p-239 single stack gun.
I have both. I have concealed carry both. The P229 is a bit more easy to conceal. I am overweight but not like that guy that was arrested and had that pistol hidden in his fat rolls.