The Wavebox and Vortechs provide two different types of flow.
One thing you may want to consider is that there is a minimum length of tank for which a Wavebox will work (I think it is 48"). The shorter the tank the higher the resonant frequency.
Waveboxes will create a tremendous amount of flow once you consider the whole volume of your tank moving a couple inches every second or so - but it is a different type of flow than you would get from a Vortech, Tunze, or Korilia which typically is a higher velocity inline with the pump and slower elsewhere.
With USC-fan, if you can, both is a great way to do it. I've got both Tunze Wavebox and Streams and it is great.