I found Delta 3200 to have more gain and though it did not hold the shadows as well as Tmax 3200.
@dcy you asked "what makes [people] prefer t-max 3200 to delta 3200." Paul Howell's quote above matches exactly with my experience. T-Max 3200 (often called "TMZ" which I'll use going forward since it's shorter) definitely has finer grain than D3200. The other main difference is that TMZ despite having higher overall base contrast compared to D3200 also delivers better tonality than D3200. I'm afraid that I don't have a good pair of photos to compare directly, but here are a couple of examples that might be able to show what I'm talking about:
This first one is TMZ. Note especially the couch pillows in the lower right corner of the frame. D3200 would in my experience not be able to render as many grey textures to either the lighter pillow or the darker one. The wall also would've been rendered a much more uniform grey in D3200, I believe.
Here's another one:
I'm confident in saying that there is
no way D3200 would've rendered the subject's skin tones as well as TMZ did in this photograph. In fact, here's someone with a similar skin tone on D3200:
Although the lighting is not quite apples-to-apples, I find the difference between these two results to be representative of my experience using these films more widely.
Here's another example of D3200, Caucasian skin tone:
I find I'm almost losing information in his face to overexposure while simultaneously not getting as good textures in the shadows.
All of these shots are on the same lens - Nikkor 50mm f/1.4 AI-S. All of them are developed in Microphen (stock). All were exposed at EI 3200 and developed per recommended times - 12 minutes for TMZ, 9 minutes for D3200, always at 20C/68F.
I also find that TMZ is sharper, or at least appears sharper - that may be a result of the snappier contrast and smaller grain. I have less technical expertise than others on this forum do, so they may be able to explain such things better than I can.
All of these images have been post-processed, and I do adjust contrast and exposure whether that's via an enlarger for prints or in these cases on a computer with scans. But, if D3200 were capable of giving me the tones that TMZ is capable of giving me, I would not by any means remove them. I do not do anything on a computer that cannot be done with a negative in a darkroom.
Finally, since others have suggested shooting digital or foregoing the exercise altogether - I want to say
@dcy that I very much think you should go through with it on film. It sounds like a great opportunity to get an introduction to high-speed films and to learn about push processing, and it sounds like a lot of fun to boot. There are reasons we shoot film, and seeking a guaranteed digital result, or being afraid of failure, are not among them.
I will say, if you're thinking of pursuing available/low-light photography more extensively, a faster lens will be very helpful.