Anecdotally, I feel like we made a mistake choosing to be the first interview on Day 1 last season. You only get 10 minutes and they (as you'd expect) weren't quite yet "in the zone" regarding the daily schedule and interview rhythm, so our interview probably wasn't as focused as the later interviews got. We had lots of fun talking with them, though, and the "first interview of the season" could have easily swung the other way in terms of being a good time to present.
But, maybe because they hadn't gotten warmed-up yet, we didn't even get to talk about the startup idea we came to talk about. We shouldn't have mentioned our existing site, but they seemed so excited about it that the 10 minutes was over in a flash without getting to the business idea we submitted.
No matter when you interview, though, know that you don't get those 10 minutes back. Focus on what you think has the highest percentage chance to get you accepted. For us, we started off with an exciting idea that just happened not to be aggressive enough for that particular round.
This year might be better off because you've already submitted a video that gives you a headstart, but make the most of your interview time, regardless of timeslot.