Both units will get the job done fine....
Both will make great images with the right settings....
Customer service at HB is outstanding...at Lowrance I hear it's getting better now than it was right after Linda "left"....

The biggest difference in HB and Low is the amount of hardware needed to have 2d sonar and SI technology in the same unit...

HB....head unit / 1 transducer / GPS antennae...
Low..head unit / 2 transducers / LSS-1 module / GPS antennae....