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Level 8

First, sorry when you mentioned the  data integration service, I though you were referring to the Adobe Form Data Integration service that is part of the LiveCycle foundation classes.  Now I realize you are asking about non-Adobe software.

Second, I'm not an Adobe Sales guy - so I won't get into the "why should I use LC over iText" discussion.  If you want to do a feature compare between LiveCycle and iText - including support, training and other sundry activities - then you should talk to an Adobe Sales Rep.

To answer your question on a technical basis, you would have to consider what you are using to create your form design template.  If you are using the Adobe Designer tool (comes with Acrobat, CS4 and LiveCycle) then you will be generating either XDP documents or PDFs that are based on XFA.  As far as I know (and I may be wrong about this) iText does not understand the XFA.