So, I'm currently using HP5 happily, but have decided to move to using Pyrocat HD. Since I'll be retesting my film speeds and development times anyway, now is a good opportunity to consider a different film. I was thinking of moving to FP4 for three reasons: I've heard great things about it. It's less grainy in 35mm, which I have started shooting again after a long hiatus. It's an Ilford product, and I'm sticking with Ilford. Looks like most people are shooting FP4 at 64-100, and shooting HP5 at 200. So, making the switch would mean losing at least 1 stop. Some details on my configuration: Shooting 35mm, 120 and 4x5 Developing in Pyrocat HD Printing on Ilford Warmtone in Ansco 130, through an Ilford 500 multigrade head So, I know this is a very subjective question, but would you switch from HP5 to FP4?