Here are the tendencies I have noticed between these 2 after playing for a while, this is all with tweaked rosters
All Star
-The human offense is pretty good and realistic
-The CPU though seems to be stupid on offense, but takes a variety of shots
-CPU always gets behind and then never catches up
-CPU likes to drive accros the lane and kick it to the corner where the ball is intercepted 90% of the time
-Turnovers are sky high
-CPU defense is a little loose and getting to the rim is a little too easy
-Human defense is just right as you can give up 38%-60% FG depending on who and how you play
Superstar
-On defense the CPU does nothing for you (this is so dumb

-On offense the CPU always posts up, so every trip down the ball is tossed to the PF/C and he backs you down and 90% of shots are in the paint
-On offense the human can't hit an open 17 ft jumpshot to save their life
-On offense the CPU hits way too many inside shots
-On offense the CPU hits every open jumper
-On offense the CPU hits 95% (Unless it is a 3pt attempt) in a shotclock is running down to the last second situation
-Turovers are low and nice
-FT bar moves at light speed
-CPU defense is tight and nice
I wish there was a mode where the human could shoot like All Star, and Play D like All Star, but the CPU played D like Super Star, and they took the same type of shots as All Star and made a few more, and the turovers were like Super Star.
I hope I made sense