Black bathtub vs. White bathtub

Since our house will be located on a slope and we can "only" cut about 2/5 of the basement into the slope as a cellar, we can probably also build with the black tank. Are the savings significant? What are your experiences/opinions on black tank and white tank?

I would like to add the Brown Tank. This was recommended to us.

Does anyone have experience with the Brown Tank?

All nonsense. [Weisse Wanne] is good. Many nowadays turn the [weisse] back into a black one because bitumen is brushed on. Double security, but not mandatory according to the latest studies.

Everything's nonsense. White bathtub is good.

Thanks for the answer, but such a statement doesn't get me any further.

Are there perhaps rational considerations? Costs are probably highest with the white bathtub. For that reason, we were now told to go with the brown bathtub...

I don't know brown tubs. Black tubs have the advantage that you can build them yourself. But how much you save, no idea.

I wouldn't take any risks there and would always go with a white tub. Save somewhere else instead.

Many people nowadays turn the white one back into a black one because bitumen is painted on it. Double security, but not a must according to the latest studies.

Implemented like this with us, for example.