Milder, more pleasant taste than Biotene
I somewhat prefer the Act spray to the Biotene spray because it has a milder flavor.  I never much cared for the taste of Biotene.  However, both products seem to work equally well in providing short-term relief of dry mouth symptoms.  Another advantage of Act Spray, apart from the taste, is that it comes in a flat container that can go in your pants pocket or shirt pocket without creating too unsightly a bulge.  Be aware, though that the Biotene container holds one-and-a-half ounces compared to only an ounce of Act.  I haven't done the math, but I think you pay more per ounce when you choose Act.  That flat container that I praised also has some disadvantages.  The flip-top lid can get in the way when you try to spray, and the spray-nozzle-button on mine tends to rotate too freely when I'm using it. So you take the bad with the good.
Rating: 3 stars