When it comes to agile admin processes, Ditto is in a class of its own.
Wave is an accounting platform first, freelancer tool second. Ditto will never have robust accounting features, but we do plan to integrate with all the major players very soon. Ditto exists to make Agile frameworks actionable for client work. Wave's platform will help you work the old way, but when it comes to maximizing flexibility and productivity, Wave looks more like a ripple.