I think they work in straight and curve hooks equally well. The most important factor is that there is an adequate hooking gap. When you see a certain "shape" for a nymph, it is a shape that is not permanent. Aquatic insects change their shape when they are free in the water.
For example, scud are tied on "scud" hooks; but scuds are straight and not curved when they are swimming. So why do we tie them on curved hooks?
"When a scud swims, its body is held quite straight
Nymphing - Gary A. Borger - Google Books
"First of all, swimming scuds, the kind fish are likely to see, are as straight as a needle and only curl up into the typical scud fly profile when they are crawling around on something."
California School of Flyfishing, Nevada City and Truckee, CA > Entomology > Scuds
I quote myself from an identical discussion,
"Often times, the accepted position of a fly is contrary to the biology of the real thing. An example is the lowly scud. Although they are commonly tied on curved hooks, scuds bodies are often in a straight position when swimming. And when are they most available to the fish? When they are swimming! Yet most fish caught on scud patterns are on a curved hook, because that is how commercial tiers tie them, because that is what the fishing public believes."
The best "shape" for a PT is the Tiemco 200R and not a scud style hook like the 2487. But in small sized 200R the hook gape is very small and it has poor hooking capabilities.
Personally, I like to tie PT's in 2XL, 1XH hooks but in smaller sizes I will tie them in larger gap hooks.