IMHO accuracy pales in comparison to searchability, so I'd use one consistent artist name in these cases.

In a perfect world, tracks would allow for multiple artists, and you could have your cake and eat it too. The early Yngwie albums would have "'Yngwie J Malmsteen's Rising Force" as the main "displayed" artist field, but you also add "'Yngwie Malmsteen" as an artist, and search for that. Or in a more common example, you could have songs by "The Beatles" and do searches for "George Harrison" to get both his Beatles tracks and his solo efforts. At one time the empeg guys sounded like they were in favor of supporting multiple artists, but we all know the story of empeg development recently.