I have an old Lowrance Hook5. I would like to get a newer unit that is colour and a 7-inch screen. I was looking at Hummingbird or another Lowrance. Are they all the same? My use would be for navigating unfamiliar inland waters in Ontario, Canada.
The size and quality of the screen drives most of the cost of the FF units. You will want the largest display you can afford. The good news is that a lot of FF become discontinued (replaced by newer models), and have large discounts on them.
Garmin usually has built-in maps. You might see if the Ontario waters are included in the FF model you choose, or whether you will need to buy additional maps.
