I voted early. By the time you get seated and start eating, you'll be starving. And, if you plan on seeing animals, earlier is better as they go into hiding a lot. The 8:00 ADR will get you out around 9:00, and you'll have the prime animal viewing times.
With the 10:30 ADR, by the time you get seated, they'll be close to taking the breakfast food away, and putting out lunch.
But, if you would like to try their lunch also, you would be able to. So, if you want to get both breakfast and lunch food, you might want to take the late ADR as brunch. Check the new ADR online system to see what time lunch starts.