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Which is best bike ktm duke 200 and dominar 400

They have both advantages and disadvantages. From a practical point of view, the Dominar 400 is the better all-round bike offering everything from daily use, touring and two-up comfort. The 200 Duke is a far more sportier motorcycle in that regard. If you want to use it mostly in the city and are performance oriented and brand conscious, the KTM is the bike to go for.