Masking would be one genuine advantage over Photoshop. Spline workflow as well as paint node are miles ahead than what's available in Photoshop. Whenever I have to vector mask something in PS I have a headache due to nonsense they put it, make a path, save the path, apply the path... good god those adobe kids have no clue what they are doing.
Color Correction nodes are superior in Fusion in almost anyway except CMYK workflow, and you have great adjustment of Ranges for midtones/highlights/shadows which is unparalleled.
Add depth of field in an instance by just painting a quick depth mask, add haze, smoke, whatever
And also qualifiers! Can you imagine that an app like PS doesn't have a proper qualifier.
That's just some of the advantages to use Fusion over PS and don't forget nodes rule over layers even in still photography.
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Oh and gradients are so much nicer in Fusion, Text+ node owns Type tool for headlines, see I cant stop