Never used the MAX yet, but I hear its as deep or deeper than the ATP so I'll judge accordingly.
All can hit those deep coins pretty close to the same depth. The Deus would have an advantage in heavy iron sites, the E-Trac would have the advantage on hard packed ground.
Now if you break that down to which gives the most accurate target ID the deepest I would have to say the E-Trac.
Used I worry but I think yes.You did not mention your budget , whether you would consider buying used? And your soil conditions, where you hunt most, what you would most like to find, whether your tone or ID preferences, Ease of use, ETC ETC ETC. It all plays into the equation and matters. Then there is the issue of, after you get your hands on all them there could be one you just like to use better cause you like it. And in the end it will be the one you find the most with cause you use it the most.
It is a great machine for sure and you can pick up some good used deals on them too.
This gives the Deus a few moor points https://www.youtube.com/watch?v=c7ZhoMH5JdM