I played with Pan F+ for a while in my Rolleicord and wasn't exactly taken with it. The grain isn't THAT small that I'd speak of it in the same breath with Tech Pan, as folks did with APX 25.(posted 8594 days ago)Pan F+ seems to EI at 40 (condenser), its curve seems to be S-shaped with a pronounced shoulder, and I wouldn't say that it's less grainy than TMX. I ended up switching to TMX myself for the few low-grain uses I have.
Tech Pan is what it is. Expensive, time-consuming, and possessing the tonal range of David Spade. I've had some good results with it in the past but I think it's better suited to being a portrait film than a general purpose film.
I think Efke might make a 25/50 B&W film you could look into.