LMS Advice / Recommendation

My advice is that you try some cool 14 demo offered by Docebo and Litmos just uploading a few courses and users and see how you like the administrative panel and the user-side experience; OR arrange demos with Totara stuff or other Vendors (Kallidus, Capterra, etc.).

Remember the thousand users prerequisite... stability is a must, and not all LMS can handle this with no issue... (moodle and moodle derived LMS are ok, Docebo is OK, Litmos sould be ok too... )

You'll find other amazing LMS around (Absorb, etc.)... test them as much as you can. e-learning from a tech point of view is 2 key things: the LMS and the authoring Tool...