Walking Zombies are popular because most people have some romantic vision that it would be easy and fun to survive in that world.
If it really happened, it would be more like Walking Dead. Vast numbers, unpredictablility along with non-stop threat would wear out most people quickly.
Running Zombies aren't as fun because they would steam-roll everything within hours. Nothing would stop them short of a Nuke within the first few minutes of an outbreak.