I don't have much experience with all the brands of finders, but will put my vote in for Garmin. When I installed my 240 Blue (temporarily) I left the plug-in loose in the bottom of the boat and it fell down into the bilge area. The next time I went to use it, the plug end was corroded from sitting in bilge water. It was basically my fault, but I called Garmin and they sent me a new power cord no questions asked and I was up and running 2 days later. Having a good product is nice, but a good product combined with great customer service can't be beat.
JMS