One opinion: You should do a search for fisheye vs wide angle rectilinear.
Regular wide angle (rectilinear) means it photographs straight lines as straight lines. Normal. There can be distortion at extremes, but which is correctable in post processing.
Fisheye is a very curved view, not natural. Interesting only because its weird - Barrel distortion, lots of it. Not correctable. Not sure how that would sell. How much of that do you see? With it on the camera, you're probably passing up opportunities.