And what about Argonians... how would you feel if someone lifted your tail to check what you were?
Probably a claw to the face, but it's actually pretty easy to tell the six of Argonians, in Arena, Daggerfall and Oblivion, they had briasts, but even in Morrowind, there were differences that were noticable enough aside from the voice. They weren't ones someone who never played the game would know, mind you, but as I played the game, it quickly became easy to tell the difference even before they spoke, so the third option is just plain inaccurate.
That aside, though, when given the choice in games, I gladly play both sixes, not at the same time, of course, that would just be weird, and most games don't give the option, but what I mean to say is that I don't constrain myself to a particular six, and instead do whatever I feel like at the time, only playing one six when the game lets me play either one would be such a waste. So which six I'll play in Skyrim depends on what I want to do when I make my character, but unless the unlikely event that I only ever make one character happens, I'll probably end up playing both at some point, it's how I do things.