The design offers stronger positive bit engagement than the standard Phillips so it reduces cam-out. But with an autofeed system, a square-drive screw for these applications will ensure longer bit wear. The Quik-Drive, Grabber, Pam, and Paslode tools are sold as attachments that you mount to a screwgun. This offers a lot of versatility, because you can switch guns for different applications. The Makita and Muro tools feature dedicated screwguns permanently attached to the mechanism.
Dedicated tools tend to be application specific.
For example, Makita offers two corded models, one for drywall and one for subfloor work. Most manufacturers will also sell you a screwgun to go with your new autofeed attachment. Handle extensions allow you to operate the tool while standing up, making subfloor work easier on your back. On attachment-type tools, the handle extension goes between the attachment and gun, so you've still got the gun in your hand. On the dedicated tools, the gun is down on the floor and you've got a remote trigger to operate the tool.