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Art M.After Bill Heitman wrote his T206 The Monster book he began to write a T205 book. In his writings on the T205 cards, which were never completely published, he covers all of the T205 backs and did NOT include Hindu as a possible back. He looked at tens of thousands T205 cards.
While the T205 Drum back is very rare, I would lean towards the Hindu as a bit tougher based on the Bill Heitman evidence.
You can also compare the 1911 T205 Hindu being distributed about the same time as the late 1910, early 1911 T206 Hindu Red back and the scarcity of the Hindu Red is well documented.