The titanium Exo frame tends to move and roll with you. The SG composite frames tend to have a bit of a more rigid feel so it’s a little more “solid” feel on your back. If you’ve ridden Mtn bikes much, you probably have noted the difference in feel of different frame materials: Carbon, aluminum, steel, titanium. It’s somewhat similar here.
Either pack is solid choice and they would likely come out neck and neck with objective testing. The vs. responses are likely based largely on personal preference and aesthetics, which, in the end, is what your decision will likely come down to. If you’re looking for “X brand, hands down” type responses to sway your choice, I doubt you’ll get what you’re looking for (and I’d be highly suspect of such statements).