Humminbird doesn't make any such model. You must be talking about the 1199 and 999. Both are good units, but the 999 wastes a lot of screen space with the overlay data. There was a software update that fixed that problem for the SI screen, but not the regular sonar screen.
I have used Lowrance, H-bird, and Garmin units. The H-birds are way easier to install and use. You don't have to study a manual to figure out how to set-up and adjust the H-birds. They are super easy to work with, and the 3 pre-set buttons are awesome.
I'm running 2 HDS-9's, and I'm wishing I had 2 1199's instead. The biggest advantage to the H-birds, is with the SI transducers. With 1 transducer, you can have 2D sonar, SI, and DI on the trolling motor. I can't even get all those features with the HDS-9 on my Fortrex.

The most I can get is 2D sonar and DI. That would take two different transducers. I do get 2D, SI, and DI on the console unit, but it has 2 transducers connected to it.
The Humminbird GPS antennas are better too. They lock on and refresh twice as fast as Lowrance. You can also use Lakemaster maps with the H-bird. You can't run those on Lowrance. You can get Navionics on the Lowrance, but Lakemaster is far superior.