I think it really all depends on opinions and expectations of inequality. In the United States we may feel that women in the Middle East are oppressed but in their countries it what they are used to and it what they expect. They may not feel that they are treated poorly, or it may be completely matter of opinion and vary from individual to individual.
If I had to pick one nation (there are many to choose from) I would say Afghanistan. Even in the areas not under Taliban control, women have almost no legal rights, no access to education, and live under a strict interpretation of Muslim law. Killing your own wife is not a crime in most areas.
The challenge within this question presumes that one nation or social order has "cornered the market" on women's equality status with men. I think that every nation has to answer to some level of inequality between men and women. Perhaps, it is egregious violations or more covert ones, but the battle for women's equality is something that cuts across national borders. I think that the other challenge within this question is that it blankets the social nuances of inequality. Political, economic, spiritual, and social realms are all domains where some level of inequality between the genders exist. Finally, one could argue that any inequality causes suffering and that there is not one which is "higher ranked" than another.
This is an extremely difficult question to answer -- in fact, it is impossible to answer objectively.
One reason for this is because you must first define inequality. Do you mean legal inequality, where women are denied various rights that men have? Or do you mean inequality in terms of how their culture thinks of them?
Once you answer this, you will still have the problem of deciding which country's inequality is worse than which other country's conditions.
You might think about Saudi Arabia as a country with a lot of legal restrictions on women. For example, they are not allowed to drive cars there.
You might think about Subsaharan African countries as places with cultural inequality. We can see this partly in how AIDS spreads very much because men are expected to be promiscuous and women are not allowed to require their husbands to use condoms.
But then someone from one of those cultures might say that American women suffer most because they are made into sex symbols and are expected to work outside the home and still do most of the work inside the house.
So it's a very tough question to answer...
This is a question that may have many different responses. Some people believe women are more restricted and abused in Middle Eastern countries. However, from my point of view, I believe that the girls and women that live in some smaller African communities suffer greatly. I have read documents about girls having their female parts cut and sewn to prevent them from having relationships until marriage. Human rights advocates have been struggling to end this practice. In addition, in the same regions, woman and girls are still stolen, given, traded, or sold to other households as servants. Of course, poverty also plays a role in the transferring of women as slave labor. Amnesty International has worked hard to help women to obtain from violent practices and abuses aginst them.