ABAP Mapping Vs Java Mapping.

We are implementing a project on XI.

We need to freeze on one mapping.

I feel ABAP Mapping provides the following advantages:

1.SXI_MAPPING_TEST is a very good transaction for debugging and testing mapping environment of XI.Iam not sure wether java mapping can be tested after deploying it on XI.

2.ABAP Mapping is well integrated with the XI and also version control becomes very easy as it is provided by the SAP transport system.

3.ABAP also provides user rich/simple API's as java.

4.Support of XI in ABAP would make sustanenace easy as it is going to be a more SAP product and ABAPers are more available in ERP background.

Java punters,Please provide inputs.