I have the Lowrance HDS7 touchscreen. It is by far the easiest unit to use that I've had. That is mainly because of the touchscreen functions.
On regular units you have to backtrack through screens and menus to change anything. The touch screen is much easier to use. In most cases you just touch what you want to change and the menu pops up for that function.
The screen is sharp and easy to read but most units today are good so the touch screen is an option I'd recommend on whatever brand you choose.

