I bought some mono flex last year from midway. Was going to try them in my son's impact but never got around to it.
Am going to test them out this year and see how they do.
I would think fairly close to the same. Mono looks like it has more pedals than the Barnes, may lose one or two more easily, cost about the same, BC about the same with edge going to Mono.
I would have to say that if they both have about the same stats that the tie definitely has to go to Barnes. They are tried and true and they won't let you down. Once you go Barnes you never go back to anything else. ..