How to display a field only if option (x) isn't selected
Create a file in template folder : node--articles.html.twig

             {% if content.field_gif_image|render is not empty %}
             &lt;div class="field-image-wrapper article-gif"&gt;{{ content.field_gif_image }}&lt;/div&gt;
             {% elseif content.field_image|render is not empty %}
             &lt;div class="field-image-wrapper"&gt;{{ content.field_image }}&lt;/div&gt;
             {% endif %}
             {{ content.body }}
             {{ content.field_more_on }}


Fields defined are just for reference, hope It can give you a clue of how to do this.