Android provides an easy way to read and write data when it is formatted as per the standard NDEF. This format is the easiest way for us to work with tag data because it saves us from performing lots of operations and processes of reading and writing raw bytes. So, unless we need to get our hands dirty and write our own protocol, this is the way to go (you can still build it on top of NDEF and achieve a custom, yet standard-based protocol).