There are a couple of different ways to approach this question.

First off, the Muzzy Zero Effect and Trophy Taker are probably the two most popular drop away rests. Ofcourse, there is a reason for that popularity and it usually is based on performance, reliability, durability, consistancy and ease of use. This can be somewhat misleading though as I cannot think of one person who installed a Zero Effect for the first time and called it " easy" ....

Some of the new drop aways on the market like the GKF Powerdrop and the Trophy Ridge DropZone also seem to be gaining a following....though I also still enjoy using the MBG Trapdoor as well.