both cars have a similar weight, only 50kgs difference so that doesnt really make much of a difference, both cars are still quite heavy and you notice it around town (and in your petrol bills).
r32 is definately more tail happy, is much smaller inside and has more of a race car feel.
the r33 has a longer wheel base, and reworked attessa, and feels much more stable and is less inclined to get the tail out unless you are really pushing it...
stock for stock the 32 is much more fun to drive, you could almost say the 33 is boring in comparison, and while it still is a fast car it doesnt feel it.
once you reach the 450-500hp mark the 32 starts to get 'unstable' and requires considerable driving skill, around this power level the 33 is just starting to become fun to drive and is still very stable.
once you reach around 600hp the 32 is starting to become unsuitable for the street, however the 33 is brilliant at this stage and shrugs off everything you throw at it, at this level of power the 33 is an awesome car.
over 600hp, 33gtr.
this is just my opinion after driving and riding in both cars at various power levels, some may disagree