Cal/Mag/Alk....Dosing pump or reactor?

[Cujo#31]

We all know Cal, Mag &a Alk are "the big 3" particularly when we talk SPS, and that of the 3 Alk is king but how do you maintain your perams and why?
I personally prefer calcium reactor as it is the lowest maintenance of the 3, with fewer possibilities for failure or malfunction. I have heard of many a tank crash or significant loss due to dosing pump failure. I occasionally have to manually dose as needed to top up on the odd occasion.
So I guess the question is Dosing pumps or Reactor??? And why