I have a Garmin 94sv with UHD and a Humminbird Helix 7 MSI. Overall I prefer my Garmin for ease of use and the 2d image. The Hummingbird defintely excels in DI and SI imaging but requires constant adjustments to the settings depending on the conditions. This may not be a fair comparison since the Garmin unit I have has more features than the Humminbird, such as touch screen, shortcut keys, active captain and a larger screen. I've had lower level Garmins and from my experience Garmin is more user friendly. Hummingbird can provide more information if your willing to work with it and it is better imaging in shallow water. Garmin for me is easier to use and I prefer it in deeper water. If you decide on Garmin with DI and SI I haven't found the UHD upgrade to be worth the investment, I would recommend sticking with the GT52 TM transducer. Both brands are good quality, the best advice I recieved is buy the largest screen you can afford.