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275/30/19 is the stock size for a 986. You could probably use either tire without noticing much difference. Handling would be about the same but the car is higher in the rear on 275/35/19. The higher aspect tire is 1" larger in diameter and rotates more slowly than a 30 aspect. Effective gear ratio is also higher so your speedo is probably right now but you are giving up some torque advantage with higher effective final ratio.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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