Islam also allows the husband to divorce as per his will but doesn't allow it for the wife, the wife needs to go to a judge and show evidence of unagreement (unwillingness of her husband to treat her reasonably well) between the spouses. If women were allowed to divorce willy-nilly, as they are generally emotionally less stable, they would lead to divorces in a rough patch of life which are regretted soon after, just like it is usually seen in the modern society. The husband has 3 rights to divorce, when he uses one of them, it's a reversable divorce. If all 3 of them are used the husband can't remarry his wife until the wife marries and divorces another man. All these together successfully lead to people not divorcing unless it's really necessary.
One can look up SWB (subjective wellbeing) rates of women and men in non-muslim and traditional muslim countries.