Which ever way you decide to carry, be consistent, and train the way you will carry. Personally, I carry my 24/7 Pro C DS .40, condition 1 safety off. If you decide to carry with safety on, be sure to train with saftety on when you draw. If you carry decocked, train with the double action pull everytime for your first shot. Its ultimately your decision, based on what you are comfortable with. Be safe.
I carry my 24/7 decocked and safety on, that way I always expect a double action on the first round and I have become very proficient removing the safety while coming to point. Just practice whatever you feel comfortable with. The advantage of your gun is the fact that you have several options, just try them all and pick the one you like the most.
I don't have 24/7, but I do have a PT145 and an OSS45 that essentially split carry duty 60/30 (the last 10 percent is when my clothing does not allow for either of those and then I go with the PF9). Both are carried +1 and safety off. Good belt, good holster, and keep your finger off the trigger works for me. Controlling my trigger finger has proven to be faster and more reliable than flipping off the safety. YMMV
I carry mine decocked - safety on. As has been pointed out - it's a matter of training. Train to take the safety off. Tis better to take off a safety that doesn't need to be taken off, than to not take off a safety that should have been.