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RE: Which one?
It's a case where you need to decide what your priorities are.
The 5400rpm drive should give you 25% more space, better battery life and lower noise (including fan noise).
The 7200rpm drive should be expected to give better performance, although it would be easier to comment on that if we knew exactly what drives we are talking about (some higher aerial density 5400rpm drives easily tie 7200rpm models).
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