How far Web service is better than RMI??

Hi buddies,
can anyone pls tell me *"How far Web Services are more preferable than RMI?"*
i am totally confused of various kind of answers?
thanx in advance.
bye,
subbu

RMI transmits objects via Serialization so is much more space and time efficient over a LAN.
Web Services transmits XML over HTTP so it can generally negotiate firewalls, which can be a major problem with RMI systems.
Web Services don't support callbacks or small transactions very well, where RMI does (firewalls permitting).
The security features built into Web Services or available via XML are superior to RMI over SSL in a number of ways.
Basically RMI is best where you want to export an extensive API via a LAN. Web Services are best when you want to export a few simple transactions via the Web.

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