Hi Julia,
Beyond the contributions you may get from this forum, if you want impartial consulting advice talk to Fosway who have deep insights on the marketplace. They can better understand your needs to help you with vendor selection.
https://www.fosway.com/9-grid/learning-systems/
In my experience, you can have the most capable system in the world and poorly implement it, or be constrained by other factors such as poor data or lack of job role/profiles which may be out of your control. The utopia of all the stars aligning is rare although you may be lucky where you work. I hope so 🙂
As you outline, I believe if you focus on the user experience, can deliver a more personalised or tailored offering and be open minded about bringing the outside-in into your learning platform then you will be onto a winner, with whatever tech you land on.
I hope this helps and all the best with your search!