The other obvious difference is the V speeds.
The 152 will rotate, climb, cruise, descend, approach and land at slightly slower speeds to the Warrior.
Also, you will need to learn the RPM for the critical speeds.
I have about 35 hours on 150/2 and nearly 200 on PA28. As a touring aircraft, the PA28 has advantages, but for me, the 152 is a better trainer. It requires more pilot input and sharpens up your handling/trimmer skills in a very positive way.
In summary, a safe and good aeroplane.
Sorry to disagree with you Gerhardt, but I don't remember the 150/2 being quick to spin - it will drop a wing at the stall under some circumstances, but judicious use of the rudder will stop the spin development and at 30 hours, that should be well within the graps of a student pilot. Now the PA38 is a different matter!
Of course, one must always monitor airspeed in the pattern, since spin recovery at pattern heights is very difficult or impossible.