Now I see, after reading about Martha in All the Women of the Bible by Herbert Lockyer, that the sisters are not in complete contrast and their personalities are needed in the Kingdom. Just as Ecclesiastes declares, there is a time for everything. If serving comes from the heart, and not in an effort to gain recognition, then there is a time to serve. If sitting at the feet of Jesus is done to be closer to Him and not to get out of doing Kingdom work that we know He has called us to do, then there is a time to rest. When things go wrong, you can cry like Mary and question like Martha, as long as you know that by faith, God will make a way.
The point is that we don't have to choose. We don't have to be like one sister or the other. We don't have to beat ourselves up for not being more like Mary or more like Martha. All we need to do is seek to be more like Jesus. There is room for every personality in the Kingdom. Each temperament and talent has its place. We can all stand together, and where one is weak, the other is strong. God made us and He knows every idiosyncrasy within our personality. Yet, He loves us dearly and will use us just as were are if we let Him.