Well??? This is complicated. I use the stock 10" on the GT, stock on the Nox too. I use the two machines for different conditions now. As a general rule, when I want to hunt the moving water more I use the GT, when I want to hunt the wet sand I use the Nox.
For the most part I am VERY disappointed with the Nox in moving Salt Water. Case in point: One of the gold rings recovered with the Nox was on a pretty rough day where I was low on the beach. I thought at one point I heard something. I re-searched and searched and yes there was a little chirp. All of this while there was moving water. I waited probably 5 minutes for the right conditions where the water drained and sure enough there was a solid 9 signal. It was a one scoop target and got it out. The target was not deep.
If I would of hit that target with the Sov, in moving water there would of been no issues and would of had that target out with out waiting. An important note, I do hunt in all metal pinpoint mode with the Sov.
Now the Sov GT in all metal pinpoint mode on a Salt Water beach is a monster. Super Stable, no EMI issues like I have with the NOX, no issues with moving salt water driving the detector nuts, the only problem...….digging everything. So the trade off is I can do more beach with NOX on a given day, but the Sov will miss NOTHING.
There may be a slight nod to the NOX in wet sand conditions. It runs very stable. Unless there is EMI issues, Hope this helps? I will also say there are different settings that will allow the nox to run better in moving salt water. I am not done with my program testing yet to comment.
Dave