One more thing to add to ^^^
with Hong Kong MAIN/FS you will end up with PinYin and Strokes input for typing Chinese. CHINA MAIN/FS is the same thing but you have simplified Chinese. And last but not least, Taiwan MAIN/FS is traditional Chinese (like HK) but the input is strokes and "bopomofo" Taiwanese input system.
Just in case you thought about and wondered about the differences between all 3 of those.