Unsolved QtCharts, the best library in QML ?

[MentalX]

Hey people,

I develop an application with C++/Qt/QML languages, and i would like to know if QtCharts is the best library for draw charts in QML ?
If yes, is there an optimal configuration for QtCharts ?

Another question : instructions accross QML from C++, or inverse, it's fast or slow ?

Thanks for reading.

Peace !