I have a Fining Buddy that I take on Canadian fly-ins, used to hang it on my old pontoon boat (fast in/out of holder) and now use it on my canoe. Operates off of 3 or 4 C-cell batteries with no transducer cables to get in the way or get caught on anything. I've had this unit for at least 10 years and it does everything I need, which is to tell me the depth and what the botom contour looks like. From what I've seen, this is the most popular unit for float tubes & pontoons, and there are even aftermarket holders for them. Sorry, no experience with your choices.

Joe