The plotly syntax is more intuitive than Bokeh which means plots are quicker to make and you have to spend less time looking up commands. The plotly documentation is also much better than that from Bokeh so you can easily find an example of exactly what you want to do.

Overall, given the more efficient syntax, superior documentation, and the fact that plotly is supported by a company I think it’s a better pick for now and for the future. One problem with Python is that there are too many ways to do everything which is overwhelming, even for those with a lot of experience. I’d say pick one charting library and stick with it until there’s a compelling reason to switch. For me, that library will be plotly because it meets all my visualization needs.