I agree with basic cost as described above. I have echomap 102sv ultra garmins on bow and console w/livescope transducer on trolling motor. To Roy's point above, the latest update from garmin says it addresses/fixes the "ghost tree." I have not installed it yet so don't know for sure. I have encountered the ghost tree a time or two but can usually reduce or eliminate by adjusting the gain. I have no experience with Lowrance's Live Target but I believe the technology and cost are basically the same as garmin.
Yes, as a matter of fact, I do have a retirement plan...FISHING!