Going by statistics, I'd arguee black, herbal, and green, with black tea leading with quite a margin. [0]
[0] https://brandongaille.com/20-uk-tea-industry-statistics-and-...
[0] https://brandongaille.com/20-uk-tea-industry-statistics-and-...
Which parts of the world prefer green? Chinese and some Asian restaurants here (Poland) feature green tea quite prominently, but that’s the limit of my experience.