The site says "The syntax is based on the darknet framework...". What are the differences in capabilities? Not sure yet. I'll have to look more into it, but I

The site says "The syntax is based on the darknet framework...". What are the differences in capabilities? Not sure yet. I'll have to look more into it, but I was hoping somebody here could tell me if they have experience with both. Why would I use this over darknet and the variations of Yolo - YOLOv3 or YOLOv4?