I asked about this product awhile back and really only got “just use Parks 50” as a response. I do use P50, and I have not tried Fusion. They are priced equivalently, so I chose to go with the known product. That doesn’t mean P50 is better or that Fusion isn’t a good product, but any oil formulated specifically for quenching will be superior to canola oil in terms of chemistry, repeatability, and longevity
of use, which equates into value over time.
YMMV, of course.