Final answer:
The excerpt that best reveals that Prince Henry thinks Poins is not particularly intelligent is when Prince Henry says, 'It shall serve among wits of no higher breeding than thine.'
Step-by-step explanation:
The excerpt that best reveals that Prince Henry thinks Poins is not particularly intelligent is:
PRINCE HENRY: It shall serve among wits of no higher breeding than thine.
This excerpt shows that Prince Henry believes Poins is of lower intelligence compared to other witty individuals.