Any call can bring in the predators. The reason foxpro is on the popular list is because they have features that make predator hunters more successful. Foxbang, Foxfade and simpler items like the recall button and presets. These minute things can make the difference between furdown and nothing.
Also, Loud doesn't always mean better. I'd rather have a clear sound than a distorted loud sound any day. But depending on the coyote, it may not matter. Regardless what you use or have, go out and try it. Can't kill them from the couch very often.