The difference between the two is that LBAs get a ton of hype from Phil Hernon followers and Professional Muscle members.
A large portion say they are a necessary staple and live by them and others say they are overpriced collagen hydrolsate. The Phil Hernon response is to try them yourself and judge.
The main difference I see is that LBAs contain glycerol. As well as BCAAs taste terrible and LBAs from when I tried were all generally pretty palatable as they are sweetened.