The one that is followed by multiple people you trust would be the legit one
nostr:npub1exv22uulqnmlluszc4yk92jhs2e5ajcs6mu3t00a6avzjcalj9csm7d828 nostr:npub1gsunl7x2y8ka4rn72y9zmzh0j8ntw8ln3956dxe4vg2mldpt4svsuzfy6l Which is your official account? Are these both legit? 
The one that is followed by multiple people you trust would be the legit one
Not always true, an impersonator can easily create thousand of followers.
