I've stopped using any published music sheet (or fake books) about 20 years ago once I realized how inaccurate they were.
I've also realized that the best way to learn tunes is to transcribe as many versions as possible, often starting with the original version that was performed by the composer (when available). That gives a broader view of tune.
Sometimes some cover versions can be as good or even better than the original (but not always).
I always think a chord chart as a guide. When performing, I would play according to what I hear at the moment, never strictly following specific chord changes in a chart. But to really understand the relationship between the melody and the harmony, a chart should be as accurate as possible. It's also more helpful when playing with musicians that have never heard the tune before.