Both are slow/low-grain films, and as such both are a little more difficult to use than, say, an ISO 400 film, which is much more forgiving of errors. That said, I think TP and Pan F are completely different, and both have their own virtues. I prefer TechPan in PMK pyro myself, but it is a fairly difficult combination--ISO 16, very little tolerance for underexposure (goes grainy and detail-less very quickly) and of overexposure (I don't know the words for what happens here...the highs glow wonderfully but get very flat and wierd). I use ISO 16 because it does make a big difference over ISO 25.(posted 8947 days ago)I haven't shot a lot of Pan F, but it is a 'regular' emulsion, designed to give typical gamma with normal developers, unlike TP, which is really, I've heard, a lith film, made for high-resolution line art etc, where gradations are less important than sharpness. I may get busted on that one, though...shawn
that all said, i don't think either is difficult to use once you dial in--just shoot some test rolls to see how the films, react, like any other film you might want to try...
hope this helps a little