That is really interesting. I had never heard of Cookmate before but looking at the pictures, it appears to be a very close duplicate of the Origo, right down to the way the fiddles and flame disburser are shaped. In fact the details of the two are so close that I suspect that the Cookmate is being made on licence to Origo.
The Origo and the Cookmate seem to be priced about the same on Defender's website.
They are very similar. In fact, at Holland Marine, they usually sell the Cookmate with Origo potholders. The Origo uses rubber capss that cover the entire burner can when not in use and prevent evaporation, the Cookmate uses a little disc of rubber that is squeezed between the upper level and the burner can when closed to stop evaporation.
Here in Toronto, the Origo is roughly CDN$100 more and the Cookmate comes with a bamboo cutting board standard.