I like all fish the same my favorite fish this season was a little 14 incher, that fish was a challenge. I also think rainbows under 20 inches are funner to fight because they are fiesty, and like getting airborn.

Oh what about the option of light rod big fish. my biggest rainbow was about 27inches I caught him on my 7 wt later that day I got out my 5wt and caught a 25 inch fish, the later was more fun-rewarding