On the chance you're confused about the products: you are aware that they are completely different products from two different companies that do the same thing, right?
After playing with the Koralia pumps from their wavemaker system, I would (and did) go with the Vortech every time. The Koralia regular pumps are excellent low cost flow pumps, but their wavemaker pumps and controllers are a disappointment considering they put you right back into the price range you were trying to avoid.