If you buy multiple units the Lowrance is less money. You won't have to pay for the SI/DI twice with the HDS, cause it isn't built in like the HB's are, and you also don't have to buy an Inter Link to Network the HDS's like you do with two HB's. The LSS-1 runs up to three units, and it IS the Network Link as well. The wiring is the same on both brands when you figure the Inter Link wiring.

If you only buy one unit, the HB's are less because you dont have to buy the LSS-1.