What I like best about TimelineJS is the use of the friendly yet highly customizable interface. More, the simplicity of creating good looking timelines just out of a Google sheet is outstanding for novices, while the use of JSON for customizing is perfect for experienced users. Moreover, the large amount of integrated media from different sources improves the storyline making the creation of great-looking timelines very effective.

Quality of the resulting timeline. Open source. Very easy to setup. It allows to specify all the parts of the timeline in a Google Sheet.

I like how easily I can create timelines that fit my needs. The timelines are also useful for chronological narratives.