Once a year, I go to Florida. I go out on the party boats and fish for snapper. I just got a reel to take on the trip, and I want to put braid on it. Thing is, I don't think those deck hands will let me fish with braid on my reel. (and I don't blame them)

Stretchy line bugs me when vertical fishing. Fluoro seems a little expensive. What do you recommend I should spool it with?

If you want fluorocarbon go with it - the cost is nothing compared to the trip. Personally I'd use what you've seen used - those guys know their business pretty good and depend on getting fish in the boat for repeat business. Can't go wrong with what they're dropping.

Mono Top Shot on Braid

1+

Fill the reel 3/4 of the way with 100# braid in case you get a mako, marlin, or something big. Top it off with 50 or 80 pound Berkeley big game. I use Berkeley Pro Spec because you get heavier test with smaller line, but it costs more. Party boat fishing can result in lots of tangles and stuff, so I normally do not use fluorocarbon. Most of the time you will only have the mono out, keeping your deck hands happy.

What he said ^^^^^