Can't speak about AIX, but it was massively more used than HP-UX. Solaris was still under pretty active development and adding new and cool features in 2012, wh

Can't speak about AIX, but it was massively more used than HP-UX. Solaris was still under pretty active development and adding new and cool features in 2012, while HP-UX seemed pretty much abandoned by HP. Itanium on HP-UX was HPs last big push on HP-UX, but after that failed to catch on they seemed to give up on the OS.