I'm no t205/T206 expert...but I'd surmise that common T206's are certainly more common than common t205's due to the length of production of t206's compared to t205.
From a desirability standpoint...that's a toughie...there are definitely more t206 collectors than T205...commons in either set are just that..."common"...pretty easy to find in almost any condition...and not terribly desirable in the vintage bb card collecting universe.
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