I don't have SI capabilities on my unit (Hook7), but do have 2d & DI. I don't even bother with the 2d screen, but go full screen DI most of the time. I never could make hide nor hair out of 2d images, so I went straight to DI when I got my latest boat.
When I had my previous unit (Lowrance Elite 5DSI) I monkeyed around with the color palettes and eventually settled on the blue. The multi-colored palettes were just to "busy" for me to determine at a glance what was on the screen. The blue was easier on the eye and the image popped at a glance. When I replaced the E5DSI with the Hook 7, I automatically set the palette on blue. Recently I got a map chip, but haven't been (in my boat) since getting it ... but, when I do use it next, I'll probably do some split screen time when Pushing jigs/cranks on certain lakes (so I can follow contours or channel edges). I run my DI at 800kHz & get real good images, especially in water less than 25ft deep.