I finished my research and have chosen the Lowrance Elite 3x as my best fish finder after looking at the Humminbird PiranhaMax 175 and the Garmin echo 301c offerings.
As a reminder, the cone angle determines the coverage, or footprint seen by the fish finder. A wider cone angle means that the fish finder will see more of the bottom.
For me, this is important because I do tend to fish shallower areas from a fishing kayak or a canoe. Why have a fish finder if it will only see a few inches of bottom coverage (narrow cone angle).