I like the weedeater with the edger attachment. But I also like the auto string winder trimmer. I haven't found any auto string winder trimmer that allows for a edger attachment so I wanted to confirm this before I purchase anything.
The PowerLoad trimmer (which is what I think you're referring to as auto string winder trimmer) is a stand alone tool and doesn't accept any accessories. The system that accepts accessories is the Power Head system and is likely what you are thinking of where you can use a string trimmer or edger on the power head. This system does not have a PowerLoad option.