Hummingbird seem to be a little easier to setup. Lowrance in the lower end of the product spectrum seem to be cheaper.
I personally have hummingbird finders. I have a 581hd up front and a 788hd in the back.. Both are GPS and both have a navionics map that I put in them.
There are some newer hummingbird units that came on the market last year, that are pretty price competitive.
Later,
Geo