Hi John
I have put in alot of hours on the XS and I am racking up hours on the C$. First let me say this, both detectors are top of the line and either would make a good choice. Here is my two bit opinion as of this date on the two, which is subject to change as I spend more time with the C$.
In areas with high soil minerialization or salt water beach, with low to medium trash content, I would give the Explorer the edge. It has a slow sweep speed and in the advanced mode you can use the learn program, with the small cursor to reject or accept specific targets.
In areas with low to moderate minerialization with a high trash content I would give the C$ the edge. It has a moderate to fast sweep speed and super fast target processing software. The C$ does not loose any depth switching from all metal to disc mode, or vise versa, and the digital display is the same in either mode.
To be fare I must also state that this is just one site that I used both detectors on, and the out come could be different at another site under different conditions. The fact is that either of these detectors will find keepers, and both have a learning curve and they will both do exactly what your adjustments tell them to do. The trick is to understand the information received from the target and make a decission to dig or not dig. Everytime you dig a target you increase your chances of finding an old coin, or gold jewerly.
I like both detectors and to be honest, I think they are the two best coin and jewerly shooters on the market. TB