I think I'd rather have 1 this year.Ideally I’d prefer the #8 this year and the #1 next.
But in any scenario - you want the #1. I’ll take Flagg all day over Peterson, Boozer, et al next year.
But I just don't trust anything anyone says about HS players. There is a world where AJ/Boozer/Peterson all aren't as good as advertised and it seems like Cooper is as good as advertised so I would just take the most certain thing.