Stam, remember the jacks and trevally we caught in Panama......like the bluefin trevally in my avatar (from Panama, of course, one that size would make the papers in Hawaii) are insane....but so are Jack Crevalle. They are ALL jacks, but in my humble opinion, I would give the nod to GTs over Jack Crevalle for pure muscle power. I have hooked them around 20-25ish pounds, but have not landed one over 10 pounds yet. Imagine taking a mean, angry Baja jack crevalle, pumping him full of steroids and saying really bad things about his mama. that is the fight of a GT of equal size. I'd rate them like this using a 20 pound fish in each species: GT fight, A+. Bluefin Trevally fight, A, Jack Crevalle fight, A-. See? There is no bad option here. Either way, you have an "A grade" battle on your hands.