One major difference is that Privacy Badger doesn't use a blacklist like the others and really isn't designed for the purpose of ad-blocking. It's designed to p

One major difference is that Privacy Badger doesn't use a blacklist like the others and really isn't designed for the purpose of ad-blocking. It's designed to prevent non-consensual tracking, so it observes which third-party domains try to store high-entropy cookies, and if it sees a third-party domain doing so across multiple first-party sites, blocks any further third-party requests to that domain. Full disclosure: I work at EFF, which makes Privacy Badger.