My interest is old coins, meaning Wheats or earlier cents, semi-key and key date Jeffersons and earlier, and pre-1965 silver for the higher denominations. (19th Century coins offer many more denominational choices but for me so far, sites with those possibilities are either permissions or ghost towns, not typical public sites as you are asking about here.) The remainder of this post only concerns those targets.

My comparison detectors (based upon experience) are two Fishers (Gold Bug Pro and F75) and the Minelab X-Terra 705. All of these are single frequency. The Equiox's multifrequency options are where I notice the difference.

Around here (Southern Indiana) where the glaciers didn't reach, the soil is moderately mineralized (2-3 bars on the Fishers' mineralization meters). In the 4-5 inch depth range the single frequency detectors' VDI's suffer, rather quickly (it seems) getting driven into the ferrous zone. The Equinox, OTOH, has a broadening of VDI but the centroid (mean, median, etc.) stays rather true. My deepest finds (only small coins -- cents, dimes, and nickels) have been from 8" depth and those gave reliable VDI's.

Another plus for the 11" stock coil on the Equinox is good separation. Since I've never touched a Deus (and only seen one from a distance) I can't compare it to those which are famous for good separation. I'm new to concentrics so can't compare there, either. But for the detectors I've mentioned above and when using similarly sized coils, the Equinox seems to have a noticeable advantage in separation abilities.