I have had Lowrance and Humminbird and I like Lowrance products a lot better for various reasons.
They perform very well for me but everyone is a bit different on what they want or expect.
My best advice on getting new electronics is not to get over excited about any of them. Don't over spend because I highly doubt they will get you that many more fish in the boat, especially if you are just a average Joe, weekend warrior angler. NONE of the present units on the market will get any of these fish to bite.
Now with that said, Lowrance is now cutting prices with rebates, etc..... on there present HDS models because a new generation is about to be unveiled. So save as much money as you can with the "old" technology because I'm sure the new stuff still doesn't have that "make fish bite" button on it.