Garrett 200i DD, 300i DD or 400i DD on silver

[doggoneitdignit]

I have a question I hope some of the experts can answer. What hits harder and deeper on silver the a lower KHz machine 150 or 200i with a DD coil or the higher 400i 10KHz machine 8.5x11 search DD coils in all metal mode. Does the DD coils work better on the Garretts for depth over the concentrics when searching deeper silver coins in general? Or is there anything else then the lower KHz and DD coil on the models that make the higher end ones better?

Thanks.

 

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[doggoneitdignit]

Let me rephrase this to see if anyone caught this.. are DD coils a wise choice to those only looking for deeper silver where it should be found when using a lower KHz machine even say if one does not have higher mineralized soils the 6.7 KHz Garrett offerings would be better over the higher models?? Where are the video comparison tests on the 150 or 200 using DD over the 400 or even the AT PRO and even GOLD.