If memory serves, triploids will live longer, eat more, and get bigger than diploid rainbows. I saw the difference in WA state before coming up here. Put trips in a rich body of water and they'll exceed 20 pounds. Rufus Woods in NE Washington is famous for monster trips that push 30 pounds! That body of water is the reason fish and game there now has a "triploid rainbow" category, or was leaning that way, because the diploid rainbow record was being consistently shattered. As for diploids at least down there, my buddies and I figured they would hit 22-24" in 5 years but only saw a few 25-27" fish that we figured lasted an additional year.