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Oldboy is right, all the tests indicate that the f4-5.6 is a slightly sharper lens. But I wouldn't let that guide me. The question you need to ask yourself is, "Do I need the extra ½ stop?" The answer is almost certainly to be 'No' as most of us try to shoot in the lenses 'sweet spot' if possible which is going to be around f8.
The next question is are you likely to want to shoot with a minimal depth of field (will only really apply to close-ups). If you do, and I can't imagine a situation where I would, then spend the extra money, if you can afford it.
If the answer to both questions is an emphatic 'No' then save yourself some money, buy the cheaper one and you're £100 on your way to your next purchase.
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