Holi and Diwali etc are the most famous festivals here. Holi is a festival of colours and Diwali is a festival of lights. Besides these festivals there are more famous festivals like Dusshera, Durga Puja, Eid, Christmas, Baishakhi etc.
All festivals are the best for me because they are celebrated for different reasons, types and customs. All festivals have their specialities and messages also :)