I suspect you'll need to do your own perf testing to find the answer.
Compression algorithms are, by definition, consistent. The algorithms used for zip are standard and interchangeable - so I'd expect to get the same compression from any 'deflate' algorithm, for example, because they are mathematically the same. I suppose you could get different performance from different implementations based on how well the algorithm was implemented.
However, if Xceed supports other compression algorithms beyond the standard zip algorithms then you could get different results.
Different types of data compresses more or less effectively with different types of compression algorithm. The zip algorithms are a pretty good set overall, but I imagine you might find that some other algorithms work better or worse (on average) against the XML data generated by the data portal.
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