Thanks for disambiguation, the raster-vector part is really a major difference. Is PS a viable alternative (even though it is a programming language itself)?
AFAIK, PDF is mostly a container for PS with compression and better handling of fonts (BTW, can fonts be embedded in PS? How fonts are sent to printer?).
Still, both formats are too much printing-oriented. Reading documentation in PDF on computer screen is not especially pleasant, and unbearable on phones.
