I voted standard door on 2 points.
1. The speed to open and close the standard door is way faster as you can fling it open and slam it shut.
2. You also can get in to the standard door car without the standard door being open the whole, even half way. You will however need to wait for the falcon doors to open almost the whole way (over 75% imho) to get in and out of as they open from the base.
It may shock people how impractical the falcon wing doors will be when they use the for a period of time.
There are still conventional doors up front, though.
Given both the frunk and the rear, using the second seats as extra storage will be quite rare (if you need all that much space, you're going to be spending so long loading up the Model X that the door open time will not matter).
Similarly, with so many passengers the relative time spent opening/closing the door is much less of an issue. It's not quite the same as loading two people in the back and going, if you've ever had 6-7 people (especially kids) in such a vehicle you know those extra bodies substantially add to loading time.
Plus, the doors are electrically operated (last I heard) and not hydraulically operated, stuffed with sensors for safety. I wouldn't be surprised if opening/closing time is configurable and can be sped up rather considerably, given that the wings also will move vertically before swinging outward.
They're not as fast as conventional doors, but they serve totally different purposes and situations. My old gas smart car's doors were extremely light (plastic) and opened 90 degrees and you could quite literally jump inside without any effort; my parent's Subaru CUV doors are much heavier and provide a more narrow ingress, slowing down that entry greatly by comparison. You don't see smart car doors taking over the entire auto market even though I'm very confident when I say that smart car doors are the best front doors ever created.