Biopellets actually have a drawback becuase if used properly they can work TOO good and strip phosphate completely from the system. Since a trace amount of phosphate is needed for growth this is bad, a ball valve before and after the reactor will allow you to tune the flow and the tumbling. Its very important for biopellets to vigorously tumble as well as an oversized skimmer to effectively and consistently remove the dust the pellets will produce tumbling in this way. This dust essentially contains the bound nitrates and phosphates the bacteria on the pellets consume. If this is not effectively removed the process becomes inefficient.
Biopellets can be just as tricky as dosing but overall the safer option in my opinion however their effectiveness depends on your setup and how your running them.
In either case i do not think pellets or dosing is a long term solution. I would eliminate the cause of the problem instead of treating it.
29g Mixed Reef, 150w 14k Phoenix MH w/ Moonlights, Reef Octopus BH1000 HOB Skimmer, Ecotech Vortech MP10es, ReefKeeper Lite (Plus), PH Probe, Temp Probe, ATO, Carbon/GFO Reactor.