Ok I want the best possible Down Imaging so would the 958 do better than the 998? I would think that the 958 would be better due to it being DI only, but if its DI is tha same as a 998 I'm gonna spend the extra $ on the 998 an get Side Imaging as well. I currently have a 997 at the console and I'm wanting the DI for my trolling motor. Thanks for any help