Really hard to say, the historical accounts say they were comparable but I think the Ajuuraan was more centralized and the Imam had more authority. Overall I think if the two had fought Adal probably would have won, Adal had more fighting experience against much tougher opponents, including defeating the Ethiopian Empire at their peak of power. Ajuuraan had an easier time and their successful war was against a much weaker series of opponents in conquering the south.
The centralization of the Ajuuraan was their downfall really, a successful coup d'etat by the Hiraab with one stroke pushed them utterly out of central Somalia and began a long decline.