Buidlings consist of standard interiors (narrow hallways, open apartments on upper levels, limited furntire, basic shops on the first floors)
Rooftops are flat
Team DC begins at blue X on far left (in distance)
Team Marvel begins at right X on far right (in distance)
Everything is on limits.
The middle street does not lead anywhere. Assume it is a dead end.
-Both teams have basic knowledge of who they are facing. This includes names and basic power set (physical attributes, standard gear, if possible, mutant abilities). They know nothing of the other team's personalities, tactics, and so forth.
-Both teams are aware of the starting locations.
-Character morals apply.
-Elimination by all standard methods (BFR, KO, incapacitation, death)
-Characters will not cause physical harm to teammates on purpose.
-Characters have unlimited ammo unless otherwise specified.
-Keep in mind, you're debating why you believe your team would win in combat based on how they would act. Not how you would command and plan the attack.
UPDATED EQUIPMENT FOR ROUND TWO
The Avengers: Captain America (Rogers, Shield), Hawkeye (Batron, regular arrows, 2 explosive, 1 grappling, 1 sonic, twin nunchaku), Spider-Man (current, no extra web cartridges)
Bat-Family: Bruce Wayne (standard batman armor, regular batarangs, smoke pellets, grappling gun,), Batgirl (standard batarangs), Nightwing (Dick, twin eskrima, wrist grappling line)