I really like having two different displays. Plus, the way my boat was cut out and designed, I have these slots specifically designed to hold fish finders, so I want to put them in there.
I'm starting to lean toward just replacing my front fish finder (which hasn't worked for 10 years) with the Garmin Striker Plus 7CV. I'll skip the side view up front, because I just don't feel like I need it for how I fish, and I'll stick to the CHIRP traditional sonar plus CHIRP ClearVü (for a Garmin).
When I'm ready to go big, maybe I'll switch to the single transducer on the back, but I definitely like knowing what the front of the boat is over instead of the back. I'll just have to see. Then I'll need to figure out the display I'll use for my dash because I currently have a 4" on there, and I'm not sure where I can add a bigger one. It's pretty crowded at the steering wheel on my Triton.