I have a Lawrence and a Bird at the front and a Lawrence and another Bird at the console.
I like the HDS units for their ability to share maps, structure scan, etc...
I like the Helix units for the superior SI/DI. I also like the Helix Lake Master maps on some lakes better than the Navionics.
It is a lot of stuff...
I might upgrade and "decluttef" the boat this winter. I really think a set of Solix units would easily do what I have four different units doing now. And likely use less battery.
RIP little Nitro