In NXT, what is the difference from Account ID and Account Numeric ID? For NXT, why are there 2 different ways of identifying your NXT account? There is a Account ID and Account Numeric ID.

What was the differences and why was it done like this?

What are advantages/disadvantages from using one or the other?
Starting in software version 1.1.3, the numeric account format has been changed to Reed-Solomon format by default (the account address starting with NXT- ) which provides higher security against typing mistakes. You still can use both address formats, but the new format is recommended.