The 5 beacons I've been using are all different.
BCA Tracker 2, BCA Tracker, Pieps Freeride, Pieps DSP, Pieps DSP Pro and Barryvox Pulse
The 3 used to do the searching have been the Pieps DSP, Pieps DSP Pro and Barryvox Pulse.
3rd place Pieps DSP
2nd place Pieps DSP Pro
Winner Barryvox Pulse
There was a small performance difference between the two Pieps but the Pulse was way out in front with reaction speed and the display and audio signals were more intuitive
*Will also add the BCATracker 3 to the tests in a few weeks.