Comparing with the vcds 11.11.5,the vagcom 12.10.3 have the following advantages:

Totally revised and optimized ODX/ASAM Data.
Includes support for latest modules in the most recent cars. Despite including support for many new modules, we've managed to cut the number of .ROD files by about half. 

Incorporated at least 17 new UDS addresses.
For modules like the BCM, Suspension Electronics, Auxiliary Heater, Door Controllers, and so on.

• Revised and expanded CODES file.
  Now with almost 18,000 fault codes and measuring block texts.
• Improved label file dataset.
  Over 100 new or revised files since the last version in August.
• Support for MyAutoScan.txt file.
  This allows users to put their own car definitions in a separate file which won't overwritten when VCDS is updated. User defined scans will appear at the top of the drop-down chassis selection list on the Auto-Scan screen.

http://www.obdok.com/vcds-12103-vagcom-12103-en-p909.html