I've nursed in many carriers but my favourites are the ring sling and wrap. A mai tei works well too. I think the ease and modesty depends on your chest size and size of baby. Ring slings are nice because you can use the tail for extra coverage but they sometimes aren't as comfortable to wear for long periods of time. I like wraps the best because you can pull the rail over for coverage and they are very comfortable over long periods of time.