Why is it better to use Proxies and not adapters

When I connect 2 systems via XI, i can use proxies (if supported by the external systems) or adapters.
The general view of SAP is that I should use (JAVA or ABAP) proxies where possible, and not adapters.
Why are these "better" than file adapter or idoc adapter (monitoring, error handling, performance, ?????).
thanks,
Jan

As received from SAP :
Proxies support both Synchronous and Async. Connectivity - ALE/IDOC is only Async.
Proxies don't use standard IDOCS, but what you decide to use in the proxy def. on SAP side.
Proxies are only supported on 6.20 onwards.
I would use IDOC adapters for standard IDOCS - and if no ABAB knowledge is available for maintenance.
If there is a standard ALE scenario available - I would use it (eg. Masterdata replication).
If ABAB is already extensively used in the organisation and they are running 6.20+ - I would use proxies.
I would always prefer proxies for Synch. Communication - instead of RFC (if running 6.20+).

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