区别如下：
1、前者可以修饰比较级（以及最高级），后者不能。
Socialism is a much higher social system than capitalism.
2、后者可修饰原级形容词、或副词（单音节除外），前者不能。
即多音节形容词、副词比较级：more expensive, intelligent, generous, frightened, anxiously
3、前者可以修饰不作形容词的分词，后者不能。
This film has been much admired, much discussed, much criticized.
4、前者可以修饰后者，反之则不能。
She is much more beautiful than she was underage.
