I am looking for a sprinkler system to retrofit to a medium size hotel of around 60 bedrooms. Being steered by one party towards standard sprinkler system and to a water mist system by another. The ceilings of the corridors are all down at the moment. Would appreciate comments.

Life or property? Water mist has the advantages of easier to meet water supply requirements than traditional sprinklers - where are you putting the tanks for a traditional system?

It seems it's preferred in the hotel sector too: http://www.watermist.com/en/case-studies/hotels-dorsett-regency/