I use the Humminbird Product. Any of the Humminbird SI units can do the same thing and so the same structure but the difference in screen size makes it easier to view on the water. I love the 1198c because it has a huge screen and makes it easy to quickly recognize and see the smaller data like fish. To me finding the fish especially singles which are normally the biggest fish is a huge key. With that Humminbird has some uniques features that make that easier. Like SI Enhance, Ability for the user to adjust scroll speed to help look inside the structure like finding fish in trees and brush piles I can adjust the scroll speed to make them easier to find. Also the 455Khz and 180° of coverage give you more coverage area to the sides where you normally cast and are looking for fish so that is more important to me than the 800kHz which is more down focused and only 110° of coverage.
I recommend taking a test ride and finding the best unit for you.