i run both on a mixed tank as a series.
Run carbon and HCGFO 24/7 with low flow and never had any issues on SPS LPS or my soft corals.
Usually change the carbon every 5 weeks and I see better extension on all my corals. Never had any problems with hair algae or any type of plant (although I like to see some green but never grows
) I run HCGFO as extra on my RODI water feeding my reef tanks.
All in all I think they both do better my tanks than not.Both media have different removal qualities as I don't see to be counteractive.Could you post the link to the article you read