… Wait what’s the third?
There’s technically 3 “official canons”.
G-Canon, or Lucas Canon, is exclusively Episodes 1-6 and Clone Wars Seasons 1-6
The old Expanded Universe
And Disney Canon
G-Canon and the old EU are often conflated, but the fact is Lucas hardly paid attention and cared about the EU, and it contradicts Lucas’ intent numerous times.
https://www.tumblr.com/david-talks-sw/704700336111304704/george-lucas-involvement-in-the-expanded-universe?source=share
Which canon is the best is up to you. Though at this point, everybody basically has their own headcanon, a mishmash of the stuff they like, including me 😃