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I did read somewhere years ago that vacuum cleaners can build up a large amount of static but I've never used one in my PC so can't comment really.
I read that too - so it must be true!
I find the difference is that with a vacuum nozzle it's sometimes necessary to get quite close to what you're trying to clean to get all the dust off so (being a clumsy sort) I end up wacking stuff with the nozzle. Whereas with a blower you can do an effective clean from further away, but with the downside that some dust may just settle back on what you're cleaning.