There are many types of spray sprinklers on the market Hunter, Rain Bird, Toro, Weathermatic, just to name a few. When confronting the issue of what is the best for my irrigation application it's actually pretty easy.
Hunter Industries has a few different lines that are designed for specific purposes the PS hunter spray sprinklers are basically a generic version for installers or contractors that want to basically plug and play when installing the heads as the nozzles are already pre-set in the body of the sprinkler. Hunter also has a model called the Pro-Spray these are designed for both residential and commercial applications and are the most common spray head you will usually find used by Hunter. The Hunter Institutional head is the last and final of the spray heads manufactured by Hunter. These are water saving heads and are made out of better material to handle higher traffic and can stand being beat up much more then than pro spray model. The Institutional model can also come with a check-valve which keeps the water from shooting straight up in the air if the head is broken. The only problem I have found with the Institutional heads is that they are much more pricey than the Pro-Spray models.
Rain Bird pretty much has the market when it comes to spray heads as they seem to be much cheaper than a lot of other brands and they get the job done just as good. The Rain Bird 1800 series spray heads come in 2inch 3inch 4inch 6inch as well as 12inch models and can handle any job residential or commercial.
The only other thing you need to do after deciding what head your going to use is what nozzle you need with it. Both the Rain Bird and Hunter nozzles can be interchanged with any of the Rain Bird or Hunter spray bodies. In my opinion Hunter seems to have alittle better nozzle than the Rain Bird version just due to the fact the Rain Bird nozzles seem to get clogged with debris and you constantly have to clean them out. Nozzles come in all sizes and spray patterns and you just need to figure out what size or coverage you are going to need.
