بسم الله الرحمن الرحيم
As per the Hanafi Fiqh, it is proved from sunnah to offer three rakahs in witr salah with one takbir tahrima and one salam. This is followed and preferred by the Hanafi scholars, whereas the other method is also proved from sunnah and it cannot be termed wrong, but that method is not preferable as per the Hanafi scholars. Hence you should offer witr salah according to preferred method of Hanafis which is proved by sunnah, as the follower of Hanafi Fiqh from India and Pakistan offer witr. Do not have any doubt and hesitation.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.