Coral is a great project, especially if you are using a completely vanilla off-the-shelf model. However if you've ever tried compiling a custom ML model for it, you know how finicky it can be. There are lots of ways that you can accidentally make it impossible for Coral to run your model, and it can be difficult to figure out what went wrong.
With Tensil, you circumvent that problem by changing the hardware to make it work for your model. If you have made modifications to an off-the-shelf model or have trained your own one from scratch, it might be a better option from the point of view of ease-of-use and even performance.