From what I can tell (I downloaded the Hitfilm demo), Fusion is far more powerful than Hitfilm. Hitfilm seems to be a ready-made solution, with lots of presets, like fire, particles, and the sort. It also uses a timeline familiar with other video editors (like Sony Vegas), but effects are in a separate timeline, and from what I have seen are not too customizable. Fusion uses a Node-based editor, with 2D and 3D composting, unlimited possibilities of combination, but seems to have fewer presets. At first, the Hitfilm interface looks easier to use, and the Fusion looks more complicated and old, but interface is just skin deep. Fusion is much easier to use, with smaller buttons and more screen space, and a more customizable layout, and Hitfilm is mostly fancy, with large things, which fills up my small screen and doesn't make the workflow any easier. They both have motion tracking, but I have not tried motion tracking in either program yet, so I cannot comment on that,
I am used to a node-based editor from my experience with Blender, so I may be a bit biased, but in my opinion, Fusion is better. I like the 2D and 3D composting integration, nodes, slim interface, and expandability and the way you can customize everything and not have to rely on presets.
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