Difference between free articulate 360 trial vs paid articulate 360

It's worth looking at the Free Trial FAQs to answer your question: https://articulate.com/support/article/Articulate-360-FAQs-Free-Trials

There is a limitation to access to the content library

The free Articulate 360 trial offers temporary access to most features for 30 days, while the paid version provides ongoing access with added benefits such as full feature access, more content, and better support. The paid version ensures uninterrupted service and additional functionalities that may not be in the trial.