I tried to get into the walking dead, and couldn't, and I think the reason for that is because the walking dead had A LOT of slow periods of time.
The thing I like about black summer is not all episodes are a full 40 to 50 minute episode, so the action is there from biggining to end.
I also like how they showed the first days of the outbreak. Humans trying to get to an evacuation point, not having much experience with guns, so some people get shot by accident.
And they don't know about Mercy yet, so zombies aren't going down easy.