AIT is a very famous institution in Asia. However, one of my friends did Master of Engineering in AIT, but he could not find a job, so has to apply for a PHD in Singapore. He did confess to me it was a mistake to choose AIT.
In terms of AIT or unis in HK, I am not in any position to comment, since not familar with both. But like to share my observation of AIT with you. just my 2cents view