The 5" readers might offer more portability for a woman (perhaps the 6" won't fit in her purse but the 5"will), but for a man what difference does it make? Anything more than 4.2-4.3" with no edges around the screen will not fit into your pants pocket. And if you have a briefcase then both will fit easily.
And for reading I can imagine that the slightly bigger size is more comfortable. So the only issue might be price, though the difference is not much.
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