Hi, PB dev here. Privacy Badger does not replace uBlock Origin, and uBlock Origin does not replace Privacy Badger. While one of them may well be enough for you, the two work well together. Our FAQ goes into what makes Privacy Badger different here[1] and here[2].
[1] https://privacybadger.org/#How-is-Privacy-Badger-different-f...
[2] https://privacybadger.org/#Is-Privacy-Badger-compatible-with...