I've developed a roll of Fomapan 400 and a couple of rolls of Fomapan 200
(sold as Paterson Acupan), all 35mm, all in D-76. Overall, I liked the
results. The film was about average in grain for the speed -- less grainy
than some, but grainier than T-grain films. I'd expect grain to be more
pronounced with Rodinal. There was something about the grain structure
that appealed to me, but I'm afraid I can't describe it -- just one of
those subjective things. Most of my subjects were old buildings and
objects; I don't know if the grain structure and tonality would work as
well for people.

Anyhow, the D-76 worked well for me, but I can't compare it to Rodinal,
which I've never used. Also, this was with the 200 and 400 films, not the
100. (As a side note, I gather the Fomapan T200 film sold in Europe is a
T-grain film, but the Fomapan 200 that's available in the US as Paterson
Acupan isn't. This is nth-hand information, though, so treat it with some
skepticism.)

Both work, although personally I prefered the results with D-76.  I
also found that Ilford's DD-X gave very good results with Fomapan 100.