I asked this same question last week, and the consensus is, it doesn't matter. You have an airlock on the carboy... as the yeast ferments, it will eat all the oxygen and push out CO2. Since oxygen can't come back in the carboy, there is no issue with it.
I wouldn't rack to as secondary though, since there would be lots of headspace. Just keep it in the primary until ready to bottle.
But... what do I know, I haven't even brewed my first batch. Just going off of basic chemistry of an airlock pushing out oxygen