Speed for side scanning should be fairly equal between the different models because it has more to do with size and location of the transducer and aerated water. The published speed for HB is up to 10mph but can vary from boat to boat. The transducer has to be submerged in little or no aerated water for best performance. I generally don't get good images above 6-7mph with the transducer mounted on jackplate. I have only used HB, but most reviews lean towards HB for the better performance in imaging and 2D performance reviews usually lean towards models other than HB. The current HB Helix models are fairly easy to operate but would depend on whether you prefer touch screen operations or a cursor type operation. HB currently only offers the Solix models with touch screen. You might also want to take a looking at the mapping capabilities for the areas you routinely fish. Finally, if you're looking to network with other accessories like a TM or NMEA, there are differences between brands.