Sonar is a monitor first of all, and we see what we see, I just trust my eyes.
What do you see on that screenshot below?:
Looks like there are sunken rocky mountings somewhere in the middle of lake on that blended dedicated DI screenshot above, but actually this is just an inclined bank bottom with some depth drop 50ft away of a bank, see below:
Which one would you trust more for seeing fish and bottom details? To me if I had that software option for a split DI, I wouldn’t use dedicated DI at all.
Screenshots were taken from here: https://www.facebook.com/DVProAngler/photos_stream