which reg. 2 stage or 1 stage w/carbon Doser?

[kevensquint]

Hi, for my Ca reactor I want to know which I should choose for a regulator. I would love a 2 stage Victor with carbon doser box. But I don't know how to install the box. So between the two options. Which is better for stability and less adjusting?

 

[3Twinklets]

Bump for answers.