If you're the kind of guy that only takes broadside shots behind the shoulder, you don't need to use Barnes bullets. But if you're no stranger to raking shots where the bullet may go through some meat either before or after ventilating the vitals, and you like to target shoulders on broadside shots, it's nice not to have bits of core/jacket in the meat, which is a benefit with a mono. Penetration without destroying a lot of meat is another. The LRX should be a bit more reliable at longer range and lower IV than the TTSX.
My experience with AB's hasn't been all that positive; at least they haven't always performed according to my preference. I've seen a lot of destruction and a lack of penetration, so they're not my first choice for close-range work. I'm sure they work perfectly fine for those that prefer their performance profile, though.
