Tough one. I will say this. I have an Advantage, with 8, 10 and 15 inch WOT coil. I can turn the discrimination up all the way, and cherry pick clad and silver ( no nickels however) and not dig hardly any trash. It also has both fixed and manual ground balancing, and can hunt it almost any condition. Super fast recovery speed and you can sweep it slow or fast. I can also use it in the wet, salt sand for the most part.
Saying that, I had to buy an aftermarket shaft since the stock shaft configuration, even under the cuff, is not as good.
The Silver is light, simple to use and life time warranty. Hard to justify letting that go too.
For me, the Advantage has a slight advantage...no pun intended ! I also think it's deeper in it's highest discriminate mode than the Silver. But it's probably twice the weight.