Boy at first I thought this would be hard to answer as I have both. On depth only, the Sov GT wins out. With the Iron Mask circuit turned on it ignores small iron which can mask a coin or gold ring with other machines.
However I have a lot of fun with the Tejon as I can set the second disc setting at pull tab and check the first beep with the Alt Disc to see if it is a coin or higher conductive target. Tejon is also feeling lots lighter in my longer hunts which adds to the fun.