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Since you are working with huge amount of data over the network and concerned about the footprint i think SAX will be better. You can harness the benefit of partial data available to you if possible.
If there is no use of partial data. You can go for just Java Serialization based solution as well. a word of caution, what if you decided to upgrade your application and your clients are not upgraded. Class cast exceptions !!
You might account for the amount of data needed to be transfered between the server and client (and comparing those two solutions in terms of bandwidth) as well before deciding.
But whichever easier is always there !!
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