It all depends on what kind of photography you are going to do with it.
Primes give sharper results, though as Andy has said, this difference is reducing all the time. Primes usually (but not always) also have wider maximum apertures, allowing faster shutter speeds in lower lighting conditions.
These benefits have to be weighed against the advantages of zooms, namely that you effectively have a whole bundle of single focal length lenses packaged into a single item. This benefit is not to be dismissed lightly.
The ability to reframe your composition quickly and easily with a zoom may mean you get the shot with a zoom. Having to swap prime lenses to get the length you need may mean the opportunity has gone.
Regards,
Duncan
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