+1 on the Garmin. But no matter what you get, put it on a RAM mount of some sort, as it allows flexibility, and access to buttons.
We have a Simrad Go7 in the Yamaha, and it is fixed mounted, and blocks the switches for lights etc. But the mapping is amazing, and works well. It is obvious that Simrad is the big brother to Lowrance, as it is much more suited as a multi purpose device and not just fishing focused.
My fishing boat/ice rig has a Garmin 93 and just added a 106 this winter as a second display in the bow/stern, or front and back of the skid house. The navionics maps are good too. But mine were bought for bottom structure and less for navigation.
Watch the garmin models, as the second digit determines if you get inland or offshore maps. ie, I bought the 93 as it has Navionics for inland, where as I think it's the 94, has offshore maps, but same unit otherwise.
You can also save loads on garmins if you buy last years transducer. I got the 54 rather than the newer 56. If you are just using it for nav, or minimal fishing, the 'ducer will not matter at all. I saved a pile on my pair of Garmins, as I bought the previous year model, and even bought the previous model livescope, 32 rather than 34, and have been very happy with them.
I am currently in the middle of moving my garmin equipment/livescope, and dual bank charger from the skid house to the boat. Oof! But these two units networked together in the skid house were awesome. We could see 4 lines down at one time on two screens!