It seems the one marked “experimental” is the one that actually works. The other produces a file that cannot be opened either by Mixamo or by Windows 3D Viewer.
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Not something I ever use or very rarely, but I do know from the weekly Blender coverage by Pablo that it has been having update and speed ups. There are lots of things they do that really most of us never see or notice, but are often important to certain areas of users. The speed of these exporters for example have cropped up now and again as having been improved.