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Garmin hands down. User friendly as well. Check West Marine Outlet on line. They always run specials especially this time of year. I like the 74DV chirp but remember you have to mount the transducer and wait until you see that thing. Its like 10" long. I had to do a little fiberglass work to insure it would stay on the transom. It's been my experience that the Whaler hull is very thin where you mount the transducer and the screws simply pull out very easy. I recommend putting a thin piece of teak between the transducer and the hull with 5200 on the teak. So you're glueing the teak to the hull and then screwing the transducer to the teak and hull. I've had several Whalers in the past with transducer scars all over the transom. Not good! Good luck.