They both have On-line Co-op, with a limit of 4 ppl per seesion
BORDERLANDS:
PROS:
GUNS
GUNS
GUNS
VEHICLES
SCI-FI
CONS:
Doesnt come out for a year and a half
Left-4-Dead
PROS:
Who doesnt like Zombies?
Valve made it
Source Engine
ZOMBIES!
Cons:
Thats it Zombies, thats pretty much it
