Personally, it all depends on the situation for me. If I'm at work, I wear them at 9 and 3, just because that looks a little more casual to me. If my wife and I are going out to dinner or to a semi formal or formal event, it's 10 and 2. 10 and 2 is more traditional from what I've read, so in formal settings, I care a little more, whereas with my just-barely-more-evolved-than-apes co-workers, there is no one worth impressing and no need to stand on protocol. I find them to be more comfortable centered.