I purchased a LNIB Etrac this in the Spring and included in the package was a 6x8 S.E.F., 10x12 S.E.F. and a 13 Ultimate plus the stock coil. I love the 6x8 but feel I don't need both larger coils. What one is more versatile? I have only used both once and I really could not tell the difference. I do want to keep one large coil, just don't know which one. Hate to see things sit in the corner not being used.