[zirgs]

As I understand - Pinyin is still the most popular one. It also is compatible with all standard Latin keyboards and doesn't require touchscreens or microphones. So pretty much all educated Chinese people are familiar with the Latin alphabet. But for most people outside China - the Chinese alphabet looks like gibberish.

[robjan]

Pinyin is used in regions where Simplified Chinese is the predominant written language, but other systems are generally used in regions where traditional Chinese is the written language e.g Hong Kong, Macau and Taiwan