One is huge - easy to enter into the warmth of the church and the welcome of the congregation. The other is small - designed to keep you out in the cold and apart from the congregation.
One is decorated beautifully and protected from the weather. The other is plain, exposed to the elements.
One requires something of you - wholeness. At least, you can't have any of the problems we are worried about. The other requires something as well - illness. This is the gate for those whose illness keeps them away, that makes them unclean.
One is so beautiful, you want to get close and inspect every inch. The other is plain, an afterthought even.