Fishfinders

 Hey guys I am looking at buying a new fishfinder and 2 caught my attention for a cheap price the garmin350c and the lowrance elite 5x HDi fishfinder. I was wondering which one is better in all ways I will be using it for only about 60 m of water tops for locating reef, caves and structure an also locating demersals and are they good and do they work for an internal transducer ?