Peat moss is very low or has no nutrients whatsoever, but it's huge advantage over coco is it's cation-exchange capacity and it's large particles that creates a healthy nutrient availability ambient. This is the reason why there's no need to have a specific nutrient package to grow in peat moss and coco does. It holds water just as well. The only disadvantage it has is supposedly related to it's availability. Some people think peat moss might end due to it's use in agriculture, but that's really arguable. In fact that's the main marketing idea behind coco, you know?
Canna Coco seems like a very nice product. I would like to see a list of the ingredients. Does anyone found one? I'm not aware of any experiment using 'canna coco' though, but it has received RHP Certification, for quality standards.
Scientific experiments done in universities, with different types of horticultural plants, have shown that peat is a better medium than coco for big yelds.