color slide film

i would like to know why some people (esp.pros) prefer to shoot slide film rather than negatives,do the former performs better in terms of resolution,color balance and saturation? i found that some slides are advertised to be 'very saturated',are they really? if so,why? Are there any negative which have good color saturation? Also,can i print the recorded image out,just like negatives? Thanks very much

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