Abu Hassan (may Allah have mercy on him) says that Sayyiduna Ali (may Allah be pleased with him) said: If the woman chooses herself, it is one separating (irrevocable) divorce; and if she chooses her husband, it is one divorce and the husband has more right to the woman. This is also the view of Qatadah (may Allah have mercy on him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 15030