By far What.CD is my favorite. Waffles has been pretty good at filling any gaps What does not have in their collection that I've looked for, but doesn't have nearly as good of organization as What does.
What also has some pretty good extras, such as auto-LOG file scoring, cross-listed contributing artist lists for compilations, artist pages, etc.
But Waffles has a cooler name so it gets bonus points there. =)
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