Im pretty happy with copper in my V1 This is just my opinion silver is about 8% more conductive than copper but the last 5% is kind of moot as its over 100%. I have a Poldiac and Honestly I can so no noticeable difference between it and the NZonic. The difference is I clean the NZonic contacts about once a month and The Poldiac every 10 days or so. Silver tarnishes so much quicker.
I guess other than bragging rights or something cool to have I can see no real significant performance advantage of silver over copper for the price.