If you're going to carry it frequently, the 24/7 is probably the better choice. If you are going to use it for house defense, I'd say it's a toss-up. Also, the 24/7 can be had in a caliber that the PT92 cannot, if that matters.
Tough call there, it's like letting us decide which girl you ought to date. What will you use the pistol for mainly, what cal. do you prefer, which one feels the best in your hand. I'd say look for a gun shop that will let you fire both and let the pistols help you decide.