Falling Skies...
I also keep up with that one and I can certainly see your point in seeing similarity in the two shows. In fact, however, if you can get past the dead getting up and walking around, TWD is a far more gritty and realistic story.
You are spot on regarding Falling Skies it has gotten stale and a bit silly with all the half alien daughter thing and the flying semi intelligent bug aliens, et al. I only watch it from habit, in a halfhearted way, because it is on the DVR, and the series is winding down to a final episode fairly soon.