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Just to counter the consensus a little: I've lived with both and much prefer skimmed (DIY or paying for it). The plasterers I've used quote the same time for either, but marginally more in materials for a full skim.
Main reasons are: strength of a skimmed surface (no rips/marks/dents over time), marginal increase in sound/fire protection and a 'perfect' finish.
Some people say you can always see when boards have been taped, but I think this is possibly only when it's done badly, or a poor board primer is used pre-paint.
Thanks for the skim vs tape replies. Tape it is! Am I looking at a standard filler I can pick up from Toolstation etc or do I need something special?