Lyle. Beat better fighters and gave great fighters very tough fights. Barrett was a solid heavy though. Beat a few ok contenders and took out some very good past prime guys like Tua and Witherspoon Lyle by Ko fun fight for couple rounds
Two Guns is one of my favorite boxers. Sort of the David Price of the early 2000s. The perennial underdog. Having said that. Lyle would find Monte's glass jaw and knock him out in the mid rounds.
Barrett is an underrated guy.... Solid resume and some good fights with top level guys, but yeah.. a prime Lyle chins him.