From the books and CSO program notes I have read, it was very different from Beethoven's training. All the Mozart children played piano and violin, and sang, but it was described by Mozart's sister Nan as more play than work. One charming story: before bed, Wolfgang would compose a melody, and sing it, and his father would start to sing a counterpoint melody, and then they'd switch roles.

I think part of the difference must lie in the fact that while Beethoven was unquestionably a genius, Mozart is simply without peer- a different order of magnitude of genius. When he could listen to an oratorio once, and then write down all the parts of the entire piece from memory when he got home- it's just not something that anyone, including Beethoven, can compete with. :) That is, while I clearly find Leopold Mozart's pedagogy preferable, I'm not sure Mozart's genius can be attributed to it.

And Wolfgang grew up just as maladjusted, if less unhappy, than Beethoven.