Of the four you listed I'd say Paragon is closer to Nine Ball and Flash Gordon, and Barracorra is more similar to Black Knight and Fathom.
Both have beautiful art packages.
Paragon has better shots IMO. More kinetic satisfaction. Barracorra has fantastic and deep rules but you will spend a lot of time shooting drop target banks on the side of the game.
Both are great games. I lean slightly toward Paragon but I would love to own a Barracorra as well if I ever had a chance.