I created what I believe are the core differences between TrainerRoad and TrainerDay in this video. Even though I might have gotten the big picture, there is always something specific to an individual that makes one platform much better than the other. I think TrainerDay is more flexible and definitely lower cost. Here is a video
As I tried to be objective in this video. I believe there are advantages to TrainerRoad as well as for TrainerDay.
If I am missing something let me know.