I tried this and it worked!. In order for it to work, you have to flash an ND3 kernel and use towel root then go back to an NG3 kernel. Follow this guide. [How-To] Root G900AUCU2ANG3 | AT&T Samsung Galaxy S 5 | XDA Forums
(Note: On step 4 in this tutorial I recommend you use towelroot reboot and use towelroot again multiple times. Root Checker may say you don't have root when you really do.
Is one easier to jailbreak and root than the other? I am starting my 2 yr conract w/verizon so not something I'll be doing immediately, but trying to weigh whether one is easier to root. Any other suggestions as to which is better welcome too!