http://www.bowsite.com/BOWSITE/featu...2005head2head/
This will give a pretty good idea of how they stack up........It's generally accepted so far that the Switchback is maybe a little more recoil and vibration free than the Bowtech Allegiance, but everything else is pretty similar.......except apparently for the speed which is where the slight difference in shot feel is obviously coming from. In the test I linked above the Allegiance was considerably faster than the Switchback and only slightly behind in the other categories head to head.
Regardless they are both very mild shooting high performance bows.....