Ca reactor all the way, I switched to dosing before after thinking it was better, it was not, switched back. With dosing you have to control each element individually meaning measuring each element more often, you have to maintain each container and the lines are pretty prone to clogging IME. It's a lot more work for no gain.
With Ca reactor it's pretty much set and forget, ph controller maintains reactor ph so you just have to watch for a steady drip. Fill media like once a year and really you only have to measure Alk which is an easy test. The CO2 lasts a very long time, you can get small 5lb bottles and all together it should take up much less space than a dosing system. If your issue with the CO2 bottle related to safety you can strap it down to prevent it from going anywhere but really it's no different than a fire extinguisher.
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