UNI sprays are not very durable...1800's are.
Again, the SRS is the same as uni...not as durable as the prospray.
Both of these come with nozzles attached...not very versatile as well as being very easily broken by string trimmer and even water pressure.
Hunter VAN nozzle is not as good as RB Van nozzle...in my opinion. I like the spray pattern on Rainbird much better...but I use the Hunters sometimes too as the spray pattern seems a bit heavier. The Hunter nozzle seems to be more prone to plugging due to small particles of sand or whatever.
Good luck
Sprinkler Solutions, Inc.
Arizona and Colorado
www.sprinklersolutions.net