Just to expand on what I said earlier, the silver one looks to be the better car to me. I'd only buy a standard car and as others have mentioned the black one is lightly modded but not in a good way, chrome mirrors and rear lights scream chav. The silver one is a higher spec, headlight washers means winter pack.
I think the thing that would swing it for me would be comparing the two engine bays, how long does it take to wipe down the engine cover and give it a tidy up?
The black car looks uncared for despite the service history that's with it, which doesn't actually mean anything. I know people who work for VW as technicians that I wouldn't trust to do an oil change, let alone a cambelt.
Black:

Silver:
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The only thing the black one has going for it is that it's a 3 door.