I have one of each...my 06 Tribute is much smoother than the Allegiance. While the allegiance is a bit faster, I found that the triubute was quieter, smoother and more accurate, even though a little shorter. Shoot both if you can, you really can't go wrong either way. I wasn't aware they came in an eighty pound limb though, but I could be wrong.

Best of luck, I've shot nothing but bowtech for three years and am a true believer...just great bows.

Kelly