Spring break deep sea ultimate locations scenario help!

My brother in law wants to take his son on an offshore/deep sea fishing excursion for something large. We do plenty of snapper and reef fishing here locally. They want some trophy fish! The bigger the better.

Lets say you could fly anywhere in North America late march to go trophy fishing... where would you go?

Cabo? Key Largo? Bahamas? Costa Rica?

Thanks in advance!