I don't think I'd feel right putting my mother through the stress of me being an infantry officer, so I'm leaning towards artillery or armored.
Not to burst your bubble or anything, but the first time i deployed, I had an armor PL, and he did the same things we (infantry) did.
And the second time I deployed, our FSO actually did double duty as a PL (one PL got hurt, and the FSO was RSLC qualified, same as our PL's).
Unless things change, everyone is in the fight now. Women, cooks, PAC guys, everybody. When we had a big mission, pretty much everyone was involved in something outside the wire.
I think there has been some great advice so far, and my two cents is to maybe first just get the hang of it and do the best you can do before you start worrying about branches. Maybe you will decide being a Chemo or something that is not normally hard to get is what you really want.
If it makes you feel better, normally the best officers I ever encountered were not Pointers, but OCS'ers and ROTC guys. Pointers usually didn't have enough life experience to really be good leaders.
One more thing - listen to your NCO's. They have spent years doing for real what you will have only learned in theory. If they say to do something in a way that is not in a TM or FM, it's probably for a reason.
And last but not least, don't ever get in a fight with a Sergeant Major. As a new LT, you will ALWAYS lose, even if you are right. And definitely don't try to pull rank on one. You will likely get beat up, and lose the argument anyways.