The fundamental difference between the campaigns of BJP & AAP is the same as that between organic & inorganic growth.
Anyone who has ever used google adwords will know the difference. Inorganic growth is like a sponsored growth with the hope that you become popular enough to withdraw the sponsorship eventually and let the popularity take its own course.
Organic growth is like fire. It has the potential of becoming a wild bush fire or equally die down anonymously, if there isn’t enough ‘ground’ support. More often that not, the momentum built using organic growth is sustained over a very long term, provided the fundamentals stay constant.
AAP’s success on the ground has been mostly led via organic growth. Whereas, BJP’s growth resembles a lot like inorganic growth. That is not to say that ALL of BJP’s growth is inorganic. But, with an alleged budget of 5000 crore, it is not totally false to claim that a lot of it is sponsorship driven.