calcium reactor media

[Willito]

I am just about to activate my new calcium reactor and was curious to what brand of media people are using these days. I've noticed that the majority are either using Caribsee ARM or Knop Koralith. These two brand seems to be the best out there with little differences in pricing. Not having to personally use these types of media before, could someone who has please reply and give a report on the products. Any pros and cons, and personal opinion would be apprciated. Thx.

Willy