Been using ( and upgrading ) Lowrance for many years and been mostly happy with them for fishing, scuba and freediving. I must admit if I was to upgrade again anytime soon I would be closely looking at how Garmin compares with its live view and ease of use. I've seen some Garmin live view where you can actually see a diver with tanks clearly moving.
I know Lowrance ( simrad ) has this same tec, as does hummingbird. Unfortunately I've personally found hummingbird to be far less intuitive with its menus ( yes I've owned them ).
My Lowrance is an older hds mk3 which performs well enough enen out in depths of 500m with a standard 200-50khz transducer. My sidescan transducer is fixed directly to the hull directly in front of the outboard rather than using the bracket.
These are a few shallow water screen shots ( depth in metres ) from my hds. The red circles show clusters of small baitfish, I don't have a screen shot of fish reveal which was part of a recent update. Fish reveal is a mix of bot the sidescan and traditional transducer which I find very good at separating bigger predators from smaller bait species.