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ewanmac-
Depends whose riding them
You might be right for the wrong reasons. While it's possible that one or the other is faster for everybody, it's also possible due to frame interactions with the rider's body that some people will be faster on the T1 while others are faster on the 464.
Back at the dawn of evidence based aeros, when dinosaurs walked the earth, I understand that some riders on the first gen Giant TCRs tested faster with the blade seat post while others tested faster with the round one.
gbj_tester
Yes, just aesthetics. I have no idea whether the T1 is faster than a 464.