Fiocchi's good stuff in general - not top-shelf, but good. Winchester, regardless of caliber, is some of the most filthy junk I've ever fired. Remington ranks a fairly close second, again in all calibers. Federal is hit-or-miss, as it's not bad in some calibers and in others (especially .45 ACP), I have flakes of black carbon junk all over my forearms when I leave the range. I used to really like Perfecta, but even though it shot clean, it was one of the few things I found that consistently caused some guns (that were otherwise not picky) to be fussy in .40 S&W and .45 ACP.
As far as .32 ACP specifically, all I've really shot for the most part have been Fiocchi, Sellier & Bellot (S&B), PMC, and a little bit of Winchester and Remington - the latter two were slightly dirtier, but not much, while the others were perfectly fine. I may have run a box or two of PPU/Prvi Partisan through one or more of my P32's over the years, I dunno, but it was unremarkable enough for me not to remember it being really good or bad either way, so I guess it's also good to go.
