I've got the Nox, have owned the Multi Kruzer and have also got to play with an Anfibio multi. I kinda felt the same way about the Anfibio as Tom said...basically the same as the Multi Kruzer; even the coils will interchange between the two.
The catch here is, it depends on two things really...what kind of soil you have and what kind of relics you are hunting for.
I haven't found the Nokta machines to be deep in mineralized ground. They like mild to benign ground conditions. If that is your soil type, you will see a depth edge to the Nokta/Makro machines. If you start to get into mineralized ground, this changes big time and the Minelab comes out on top.
The Equinox favors low to mid conductors. It works OK in iron, especially for an 11 inch coil. Not a fan of the 6 inch coil on it though. The other thing is...if you are after iron relics, I wouldn't recommend the Equinox. I have a site that has cannonball and shell frags, and cannister balls....along with fence wire, nails, etc. The Equinox really compresses the iron range and you can't really get a feel for what size the iron is, and the numbers are all basically the same in the iron area....so shell frags and fence wire sound too close to the same. If you were water hunting for shells and that kinda thing....I wouldn't want to have one. That's where the Anfibio/Multi Kruzer would pull ahead again IMO.
I sold my Kruzer and did not buy an Anfibio after seeing how similar to the Kruzer that it was. Two good things about them....they have great customer service and a wide range of coil options. I just wish they worked better in my soil.