ZBrushCentral

Character modeling reel question

Hello, I am wondering something about creating a character modeling demo reel. Do companies like it better when you create models based on concepts done by other artists since that will be the same process in a large studio, or is it better to make your own concepts for your models, since that shows your own creativity and character design skills (in addition to modeling skills). So far I have made all my own concept art for my models and I am wondering if I need to change my strategy. Thanks for any replies!