I think the big fish are a lot like game animals, it's all in how they are processed.
I prefer the smaller fish, but have eaten many big ones, first I hang the fish, head up, alive, and make several deep cuts along the tail and let it bleed out before skinning and cutting into small pieces, make sure to cut the FAT away. I like to soak in buttermilk, take it out and put it directly in a bag filled with cornmeal, salt and pepper to taste, shaake it until fully coated then deep fry until golden brown. There is usually non left on the platter after dinner.
The largest we ever ate was just under 47 pounds.