Here's my take on the eternal CTX 3030 vs. Equinox Debate
A lot of it overlaps with what has already been mentioned but there are a couple things that I feel need to be addressed.
CTX 3030 - disclaimer: I am not an expert on the machine but have used it and have received instruction from Andy Sabisch on some of the finer aspects of the machine. I am very familiar from a technical standpoint of the differences between the two machines and despite both being multifrequency machines, there are a number of performance differences. Some of those differences favor the CTX others favor the Equinox. As Power Dubs said, the optimal choice really comes down to what your detecting objective is.
The CTX excels at precise visual target identification at depth and has a very sophisticated, programmable discrimination scheme that permits precise target cherry picking. It rightfully has a reputation as a deep silver slayer. On the other hand, it is relatively heavy, tends to have a relatively complicated user interface and menu navigation scheme, is, at best, average from a recovery speed perspective (and is basically locked to a single recovery speed), and is not as "hot" on mid-conductive targets as the Equinox - therefore it is not as sensitive to small gold, brass, or nickel targets as Equinox. It also only has basically one multifrequency profile (compared to at least 7 for the Equinox) [note that the different FBS2 "channels" don't count as different profiles, they are more about eliminating EMI and the different user settings and discrimination programs only serve as filters not target enhancement profiles).
The Equinox on the other hand is light weight, straight forward to program and navigate, has multiple multifrequency profiles optimized to different target and site situations including gold, jewelry, and relic hunting, has superior hot ground handling compared to the CTX (a lot of this is associated with its high recovery speed capability which suppresses ground noise), has a large, adjustable range of recovery speeds, and has a more refined signal processing approach with Multi-IQ vs. FBS. On the flip side, it has a relatively simplistic target ID and discrimination implementation. This provides simplicity and target ID stability but with its limited audio modulation, can make it difficult to discern certain types of targets if you are really into precise cherry picking detecting.
The Equinox is a more versatile detector than the CTX overall. It also excels in thick iron and hot dirt better than the CTX and let's face it. Sites have been hammered for years so the deep silver that CTX excels at finding is drying up and not being replenished. The good finds are hiding amongst the iron at relatively shallow depths because detector technology, until lately, could not handle that situation very well unless you just wanted to beep and dig every piece of iron. That is why fast detectors like the Equinox and Deus are becoming more popular than the slow, deep silver slayers. I think the next iteration of ML's Multi IQ detector (the successor to Equinox) should further close the gap between Multi IQ and FBS2 by incorporating the sophisticated target ID and discrimination capabilities of the CTX combined with the fast and versatile capabilities of the Equinox will truly make the CTX an obsolete but classic detector. IMO.