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Actually the industry standard format for Mesh Files is .FBX. Generally there isn't "one" best format, they each have their ups and downs but when it comes to selling models its best to provide a wide array of formats.
Blender can export to a large quantity of formats however they are not all enabled by default. By going into Preferences->Addons->Import-Export you can turn on and off the various export format options
Of course there is not just one best format, but there are the ones that sell better :)
I did not know about the Addons Import-Export, good to know, thank you!
