Well, TMax 400 is a film designed for use at EI 400 or thereabouts. While it might make sense to you to compare it to Delta 3200, you have to remember that in order to get a useful comparison between two films, you have to develop them to the same contrast, or you are comparing fire trucks to bananas. You want apples to apples.
Picture quality between TMY and D3200 should be compared with the TMY at 400 and D3200 at maybe 1,000. Then, of course they will behave differently when you start pushing them. At 3200 TMY will not have been designed to record as much shadow detail as D3200.
For certain practical matters, it does make sense to compare the two films - at the EIs you intend to expose them at. That's for sure. But a technical comparison between the two is something different entirely. I think the Kodak data sheet on TMY states that the film can be used at 1600 with acceptable results, and 3200 with compromised results, all while D3200 is designed to be used at those speeds, with little to no image deterioration.
How a negative scans will bear very little impact on how it prints in the darkroom, by the way. The scanner is a linear device that within its range records the tonal information of the film in linear fashion. Your enlarging paper has a very different range, and there are all sorts of tricks to get tonality out of a negative where a scanner cannot, especially dense negatives where the scanner might not see through the tones much at all.