"As to" is often used when there is a question, or something that needs to be decided or found out:
Have we made a decision as to who will carry the flag? (who will carry the flag is unknown)
'About' is more general. I recommend you use 'about'.
August 7, 2014
Still haven’t found your answers?
Write down your questions and let the native speakers help you!
Chinese (Mandarin), English, French, German, Japanese, Russian