The additional person added to team DC is needed to offset the meta human advantage of Cap WS and USAgent...
This is the type of fight team DC is designed to take on as they usually fight above their weight class.
Too close to call BUT Bats is always prepared with some tech/gas/trap to handle overwhelming force. Also team BAT with Batman, Nightwing and Red Hood offer a seasoned team style fighting methodology that would be difficult to handle. Think Obi-wan and Anakin battling Dooku (the second time)
Cap family has the physical superiority , but the bat team much better at gule and tech!