Tmax developer can be used multiple times by increasing the development time. 1 liter will do up to 12 films. I use it with Tmax 100 and like the results I get. I find it too expensive to use one-shot.
However, I prefer to use Rodinal whenever I can, but I did not like the results I got with it and Tmax 100. Rodinal is cheap and one-shot, the only problem is all the waste it produces which I take to a recycle/environment center (or whatever it is called in english).
Yes, I know you will all object to increasing development time as you get non-consistent results. However, I do not really care as I am not that advanced, at least not when it comes to film processing. I use whatever is convenient and works for me and do not bother so much. If I get results that I like, then I am happy and keep using it. If not, I try some other combo.
Maybe I should be more careful about this, but I just find the whole concept of testing film and development times boring. Just as I find advanced darkroom dodging and burning boring. Fortunately, I get results anyway that are to my satisfaction, otherwise I would rather give up B&W (at least in darkroom) and go digital or just shoot color slide film.
My highly non-scientific findings are as follows:
Tmax 400 is a hit and miss. Can be lovely in Tmax developer and work OK in ID-11. In Rodinal the grain is ugly. I have stopped using this film as I felt it was so-so and do not work well with Rodinal which is my preferred brew.
Tmax 100 is very good, at least in Tmax developer and I like the results. But I am not at ease with Kodak so I will try some other 100 films soon (Acros, fp4+ and Delta).
Tri-x is very good in Rodinal with visible and pleasing (to me) grain.
I hold Neopan 400 at the same level as Tri-x, I have not yet come to a conclusion which I like best.
I do not like any of Tmz or Neopan 1600. Neopan 1600 has some merits, but it is just to grainy and muddy. I have only tried it in Rodinal.
My future 400 film will most likely be what I can get cheapest of Neopan and Tri-X, though I lean towards Neopan as I like Fuji as a company better.
If I can find a 100 film that works in Rodinal I might stick to it, otherwise it will have to be Tmax 100 or Delta 100 in Tmax developer.