Just read this thread,I'm supprised no-one has mentioned the fact that the 152 has a more powerfull engine (115/118hp) than the standard (100hp) 150, but the increase in weight is exactly the amount that it takes the extra horses to lug it into the air!
There is no significant differance between a well worn 152 and a good 150 ,in fact a pristine early (read-light) 150 can out perform a slghtly tired 152.Hence it all comes down to the condition of every idividual plane.
The choice of prop is an important factor in cruise performance,most 152's have corse pitch props fitted as standard and don't achieve anything like full power on take off (max power @ 2750rpm). You can get cruise props for a 150 but the climb is degraded.
General rule of thumb is 2 aircraft in good condition,early 150 will come off the deck better,more suited to small strips(250 yards flown light) but a 152 will cruise faster,but not significantly unless you are going over 100miles.
The early 150's fly nicer and lighter controls in my opinion.
I have operated a number of both and ferried many of both!