Normally, an arranged marriage is decided by the two members of the couple. Sometimes families also intervene in arranging the marriage. In the case of forced marriage, I believe the spouse, the woman, is forced into that type of marriage. She doesn't choose it, but is forced into accepting it.
That said, we have seen situations where abuse is present in both types of marriages. As I said, it is important to prevent any situation that leads to abuse or makes it worse.