Another comment: Gandy mentions, among many others, the Anton Bruckner commemorative edition. Suffice it to say that Bruckner is a somewhat problematic composer to consider. For reasons known only to God, some of his symphonies, particularly the earlier ones, exist in several versions, and recordings can depend on which version the conductor chose.
There is nothing unusual about composers revising their works after trying them out. But the final version by the conposer is normally accepted as the 'standard' version. In Bruckner's case, not only did he himself make revisions, but later "editors" seem to have gotten into the act. So it can be a toss-up.