This subject is like jumping down the rabbit hole. The humminbird units are great. I personally own some g2 helix 10s and love them. But, I have had the opportunity to use other.units by other manufactures. I come to.realize each have there specialized or outstanding features but the main guidance I would recommend is... 1. Your budget 2. try out a few before you buy 3.SET Up correctly once purchased 4. keep in mind ease of use and more isnt always best. Units with gps, sd card, short cut buttons, depth lighting and dual frequencies are.best, and will provide longer lasting purchase satisfaction. But, just my thoughts..