An LMS proves someone watched a course. Oanax proves someone did the work, on the current revision, signed off by a person.
There is overlap: Oanax can also offer learning content and track progress. The difference is what the evidence means.
An LMS records that a course was completed. Oanax records that work was done: the checklist on the floor, the photo as proof, the questions with a pass mark, the sign-off by a manager or mentor — per step, with a name and a moment, against the revision that applies now.
For a catalogue of hundreds of ready-made courses, an LMS serves you better. For proving that your people know your procedures and master your work, it is exactly the wrong tool.