Funny 7200 results ...
Though I'm probably not the only one telling people -- that a 7200RPM drive only spins fast. aka, marginally better seek times.
The cache will make a huge difference, if one drive has a bigger one -- it'll perform better. Because for small sub-8MB transfers -- it's all cache.
Some drives have more advanced mechanisms, these drives will have a mechanical advantage in transfer rate.
Otherwise all drives will operate around the same MB/sec in notebooks.
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Get the bigger drive, get the bigger cache, and definitely buy the cooler drive.
In desktop drives, skip the desktop drives and buy an enterprise class drive -- they may be noisier. But so what, they just may last longer.