Carwale is undisputedly the best site for car comparison in India. I am using the site for almost more than 2 years now for comparison of new launches with the existing cars in the same category in terms of features.
The USP of this site is apart from comparison it also provides the on road car prices for all models for all major cities without asking for contact details, unlike its competitors, which allows people to get rid of a lot of call from local showrooms & allow us time for research & finalize on options before purchasing a car(being highly priced it is not something that people like me, can afford switching in 2 - 3 years). Apart from this the site is pretty user friendly.