Hey man... just want to give you my experience with those two guns.
My dad owns the p239 in .40 and 9mm. I have only ever shot the .40, but all i can say is WOW! it is got to be one of the finest guns that i have ever put in my hands. That being said it does not fit my hand properly. I have the issue that my fingers are "smooshed" by the grip being .5" too short. Other than that the gun pulls up sighted every time, controls and trigger are in great positions which i had no issues with what so ever. Over all the gun is amazing, i highly recommend it especially for ccw because it is single stack and a bit more on the slim side. As of right now to this day i don't think i have ever shot a finer pistol than the 239 (my colt 1911 is close though :wink
as far as the 229 goes, it is a very good gun as well... although my experience with it was not as good as the p239. The 229 was a little bit too big for my hand due to the double stack mag. My hand is large but fat too, so a thick grip greatly reduces my hands wrapping ability. I went to a range and rented the gun and found that when i shot it the gun wanted to jerk up and to the right. I'm sure that is due to my hand not being able to grip all the way around it comfortably. the 229 was still a good gun, but for me it just does not work.
so to summarize, the sig is an amazing weapon. My personal experience rates the 239 better than the 229, in both cases the grips are whats keeping me from owning either, but the 239 IMHO shoots smother than the 229. In either gun you will get great features and a well built gun, I would definitely say to rent these guns and test them before dropping the coin on them. A sig is a huge investment, and i would hate to drop that much coin on a gun that isn't 100% satisfactory to you.
hope in some way that helps.