For most forms of photography, a zoom is by far the more practical. 10yrs ago, zoom lenses were optically inferior to fixed (prime) lenses by a considerable margin, but they have become better all the time. A zoom lens makes it easier to perfectly frame your subject without having to physically move yourself.
If you know exactly what distance the subject is going to be with most of your photography, the slight optical advantage of a prime lens maybe worth considering... but for the most part, zooms make sense.
What focal lengths were you thinking about?
cheers,
Andy
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