7:50..you're ADR may be for that time, however, that doesn't necessarily mean they are going to seat you exactly at that time. If you go for the later time, there is no way you are going to be at your table in order to see them. I am sure there are people that are going to "stall" in order to see the fireworks from their table. That is if your main priority is to see them from the table. Either way you could always walk outside and see them...Depends on how late you want to eat as well. Figure with a 7:50 ADR, you might be eating by 8:30...9:20 ADR you will be eating earliest 9:50...