It's far more comprehensive (covers more fingerprinting vectors), and since it's baked into the browser you're far less likely to run into webextension limitations causing your protections to be defeated[1]. Finally, being the "official" implementation, and with only an on/off flag, you won't get fingerprinted based on what fingerprint mitigating extensions you have installed (eg. maybe you have canvas blocker installed but not webaudio blocker?).
