It is what works for you. You aren't aiming for as pure of water as I am in my reef tank. I run a refugium, skimmer, and a dual reactor with GFO
and Purigen to keep the water as pristine as possible for my SPS
The key to something like this isn't to rely on one thing, but each do something different.
Skimmers pull waste out of the water column before it is consumed by the nitrate cycle.
Refugiums and algae turf scrubbers lower nitrates by growth of algae, just different approaches.
filters are worthless on a hobby grade. They don't have the ability to have enough water pass through them to be effective like one on your water line, where ALL of the water passes through it. UV
will kill everything that passes through it, even the good stuff, if they were as effective as they claim.
Chemical media all do a ton of different things, like GFO
/Phosguard/Rowas will attack the phosphates that are part of algae issues and slow growth of calcium based corals, LPS