My choice for carry is a 40 caliber Sig P239. Accuracy is simply stunning, back when I could still focus on handgun sights shooting a 2 inch group at 50 feet was easy, now it requires a bit of concentration.
As for it's reliability, in over 2000 rounds downrange I've only had one single failure, a dud primer on some Federal Champion from Walmart. Doesn't matter what I've fed it, it's shoots anything.
It's also my favorite semi to just shoot. Yeah, with the 40 it is a bit of a firm ride but it fits my hand perfectly and I would much rather drive an old Mustang GT than a Lincoln Town Car. So the fact it bucks a bit doesn't bother me one little bit.
BTW, I also have a 40 caliber P229 Elite Stainless. That one is a Lincoln Town Car. So smooth shooting it's a bit boring. Which is why it's only sent 600 flawless rounds downrange. However the slightly longer sight radius does allow a bit more accuracy in shooting, my best to date at 60 feet is 1.5 inches.
Granted, my guns are 40 calibers but I would expect similar performance from the 9mm versions. Meaning, they'll be plenty accurate, perfectly reliable, and a bit cheaper to shoot than the 40 caliber.
Now, one tip on the P239. The grip frame on this pistol has a flat front strap with sharp corners on it that will "bite" a bit. For about 20 bucks Hogue offers a finger grooved wrap around rubber grip that solves this problem totally. In addition, for me it improved the pointing characteristic to perfection and provides a distinct improvement in recoil management. IMO, this grip is a must have for the P239.
As for the P229, hand size should be taken into account when selecting a specific version. Sig recently introduced the E2 series to accomidate shooters with smaller hands. If your span from thumb tip to end of the little finger is less than 9 inches, you'll want to go with the E2 version. If it's 10 inches or more, you'll want the standard model. For those between 9 and 10 inches, either will work fine but the E2 will need to have the short reach trigger swapped out for the standard reach trigger.
BTW, older P226 and P229 pistols can be converted to the E2 grip for a fee, so if you find a used bargain and the grip is too large there is the option of having either converted to the smaller E2 grip. However, it's more involved than a simple grip change and currently is a factory only service.