I have lowrance and humminbird both on my boat. each are equally great gps and fish finders. i have 798 side imaging humminbird and love it. check to see what maps are pre loaded with each unit you look at and see if they are sd card compatible. also i like humminbird little better do to ease of removing the head unit for storage. push button and it pulls right off. lowrance you have to unsrcew 3 wires on my unit and unscrew wingnuts from mounting bracket. both are great units for the money.