THAT is a hard question for us!
On one trip to Loreto, the MOST memorable fish of the trip was a Ballyhoo taken on a 3wt with a #10 shad fly. THAT fish took more thinking and pestering than any of the dorado, sails, small roosters (on the 3wt also), or any of the "rock fish" we pestered that trip.
For us a LOT depends on how you have to approach the target. We would MUCH rather pester BG's on top than the biggest LM's sub-surface.
Good question....no wrong answer.
....lee s.