Sticking with all Lowrance, you'll obviously be able to network the graphs together. The biggest advantage is making waypoint management seamless, otherwise you're stuck having to transfer waypoints back and forth between the two graphs. Case in point, you wouldn't be able to see any of the waypoints you currently have on the console graph if you had the Garmin at the bow without doing an export and import. Same is true if you dropped a waypoint on the Garmin and then wanted to add that to the Lowrance. If you're proficient at this, then this might not be a big deal.
Jacob Wheeler I think does a fairly objective head to head in his video. He's on the water, shooting at the same structure, running through the same scenarios, and showing you the graph images.
Two things to consider with Garmin. 1) You can reach a real human when you call their tech support line. 2) Since it's been out for a couple of years, there's quite a bit of community support, troubleshooting, and tips and tricks on the Web.