Unfortunately, law review is seen as more prestigious than secondary or subject matter journals. At some schools, this is because the selection criteria is different - law review factors in grades and the other journals don't. But, in general, the profession does have a hierarchy of journal memberships. That said, there are plenty of members of those secondary journals that will get the same clerkships and jobs as the law review people. As for what interests you, remember that if you make law review, you can write on whatever interests you.