Switch entry type based on the category

Question

I'm trying to use different entry types for certain categories. My category group is called categories, and the slug for Features is features. I have the category group pointed to categories/_entry. As for as I can tell, I've got it set up right. I think their might just be something wrong with my switch code. This is my code in categories/_entry:

{% set categories = entry.categories.first %}
{% switch categories.slug %}
    {% case 'features' %}
        {% include 'categories/_feature.html' %}    
    {% case 'news' %}
        {% include 'categories/_news.html' %}
    {% default %}
        {% include 'categories/_news.html' %}
{% endswitch %}

Answer 1

The above isn't too clear, but what I was trying to do is use different templates for different category landing pages. It works with the following:

{% switch category.slug %}
    {% case 'features' %}
        {% include 'categories/_features.html' %}   
    {% case 'news' %}
        {% include 'categories/_news.html' %}
    {% default %}
        {% include 'categories/_news.html' %}
{% endswitch %}