Arbitration is the most time and cost efficient option if you are unable to reach your own agreement, either by yourselves or with the assistance of your lawyers or a mediator to have someone else make a decision on your behalf. This is true in almost any situation where you might make an application to the Court.
Whereas within the Court system it is first necessary to attend a Mediation Information and Assessment Meeting, in arbitration this is not necessary. Hopefully, a couple will have endeavoured to reach their own agreement in any event. Arbitration is available for those who simply need someone else to make a decision for them.