Just a point to remember. E6 does not blow highlights or block up shadows ***when it is exposed in conditions it was designed for*** -- diffuse illumination. Problems will develop in marginal conditions (not always taken notice of by photographers!): overexposure of scenes with marked spectrals in point illumination is one recurring theme. As to the question, what is best for one or some photographers is not necessarily going to be the best for another. Skills, experience, knowledge of exposure and intention of the end product all feed into the broader question.
The vast majority of trouble with slide film is with the photographer, not the film.
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