DiXactol and zone system - two bath or single?

[Usagi]

Hi,
I am fallen love with DiXactol Ultra and now I am planning to calibrate Ilford Delta 100 for it.
The thing I am wondering is that is it better to use DiXactol as single bath developer?
I am interested about two bath because it allows controlling of the negative contrast by using second bath in different strenghts without changing developing time.

 

[Jarin Blaschke]

When I used DiXactol, I used a single solution. In my mind it was more straightforward to only alter the time variable. It may be preferable to change developer strength if you are doing expansion beyond +2.

 

[Gerald C Koch]

With a two bath developer you have no control over zone placement. The degree of development is essentially built in. You can attempt to vary the times in Bath A or in Bath B but the results aren't really satisfactory. Same for changing the composition of Bath B. The Zone System really needs a conventional developer like D-76. Read Ansel Adams book The Print for more information.