Briggs is tough when he faces an overmatched opponent but Lyle would hit back and quickly wear Briggs down. Lyle in 5 or 6 rounds by KO.
Briggs does the job. Lyle seems like a slightly better boxer but his gameplan is the same as Briggs' gameplan. When these two exchange, Briggs has the toughness, the power and the size.
Lyle is the bigger hitter to me. Briggs has quicker hands but i think Lyle wins in a thrilling slugfest.