I used Rodinal for roll film, but it's too grainy for 35mm. I like fine grain developers.
... I shoot people.
That's not necessarily true, although I would say fine tonality is mostly the result of fine printing. Printing, printing, printing.
Before looking at developers it is the choice of film that should be given consideration with respect to tonality as different types of films, and films of different speeds, can have different gradation and micro contrast characteristics.
The type of developer can have an effect on both macro and micro gradation. However, development technique has a profound effect on these characteristics with any developer/film combination, so what MaximusM3 says is true - ie it is how the photographer uses the materials that has most to do with the outcome.
But since OP is asking a question, considering everything I've said above, I'll answer by recommending XTOL (at 1+1 dilution for a starting point depending on the film) as perhaps the best overall general purpose developer for 35mm film. It is mildly speed enhancing (which can certainly help with shadow tonality, particularly if the film is a little underexposed), has good sharpness, good flexibility and very fine grain.
A naive question: What is tonality?
Why would tonality even matter when deveoping film? It's all black and white anyway and it makes practically no difference when printing.

A naive question: What is tonality?
You are kidding, right?![]()
For me tonality means the TONE, just the colour of blacks and grays. So no, I'm not kidding.
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