Simply put, Standard supports other devices than just Line6 hardware.....L6 version is tied to using the L6 interfaces. Other features as noted here:
http://www.sonomawireworks.com/riffworksfeatures-Line6.php- 1 extra ID included with purchase (9 for standard, 8 for L6 version)
- Amplitube live 2 plug in included
- render to vav format
- 32 bit recording and mixing
- Sonoma 7VST plugin
Standard is so much better, you will be glad you went Standard I guarantee you!