Both will work equally as well, a DIY works fine too. May I ask why you want to use a sulfur denitrator vs other simpler and cheaper methods?
The reason I ask is because I have used EVERY type of denitrification method known and settled on the simplest and cheapest. Carbon dosing takes the prize in my book, it works without complicating things and having to tinker with stinky and finicky sulfur based denitrators.