Cast-iron Tawa vs Non-stick Tawa- Which type of Tawa is good for Dosa?

Cast iron Tawa has been used since ancient times. Many of us prefer non-stick Tawa over Cast iron Tawa as usage of oil is less, less sticking of dosa on the pan, ease of use, etc. We prefer to get along with the trend. When non-stick pans were introduced to the marketplace cast iron Tawa started los..