I'm not trying to say one is better than the other. Like I said both units have received high praise on this site and beyond.
They do have some pretty different features though. When using pickups that have a lower signal the ability to substantially preamplify that signal can be pretty handy. Does f-deck's gem have and xlr out? That can be handy if you are playing big venues where the soundman insists on a pickup line.
My post was about terminology, not features. I did mention that, for what it is, I really like fdeck's device.