Crash Site is set on a big sprawling open landscape: an escape shuttle has crashed and the lone survivor is somewhere in the wreckage. He is surrounded by enemy units that are advancing, but a small band of rescuers are trying to get to him and escort him back to safety.
The Raid is set on a much smaller map, and has been primarily designed for the smaller Android client. Set in a small building which houses the planet's worst scum, a squad of galactic police must raid it and kill all the gang members.