I've got both, and shoot both -- regularly. To be honest, if you blindfolded me and put each of them into my hands and let me shoot them, I'd be hard pressed to tell you which one I just shot.

The Allegiance is touted as being faster, though it's hard to see with the naked eye. The Tribute is touted as being more shock-free, though when compared to the Allegiance the difference is minute at best.

I put speed mods on my Allegiance and smooth mods on my Tribute to accentuate the differences because of those reasons.