Bio-pellet or GFO?

[Deep_azul]

Hey, I've just had my tank running for approximately four months and I'd like to add a media reactor. Presently it's a FOWLR with a plan to add corals when it's properly matured. I was wondering what the concensus is on media for reducing phosphates. I think GFO would have a more immediate effect but it sounds like bio-pellets might be better long term. Opinions? Thanks