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Depends on the dryer. If you've got one of the new efficient ones (heat pump?) then the dryer is probably a bit cheaper. That will only dry your clothes though, not remove condensation, etc.
Obviously there's also some cheaper options. After a shower or when drying clothes I tend to close the door and open the window a little. Doesn't have much of an impact on the rest of the flat and lets some of that moisture out. In the morning I open a few windows to get a bit of air circulating. The heating isn't on and I'm off to work so it doesn't really matter if the flat gets a bit colder for half an hour.
Which uses more electricity - running a drying cycle or hanging up damp washing indoors and using a dehumidifier?