it depends on what you're looking for. springer has more in the way of USpsa and IDPA mods, compensators, beveled magwells etc. powder river seems to have a lot of your average everyday mods, sites, red dots, triggers, grips etc.
they each bring something different to the table
for instance triggers. the springer triggers remove more travel and reset distances where as the PRP trigger lowers more pull weight.
red dots, springer can mount them on the slide making acquisition faster where as PRP has a mount that attaches to the frame so the red dot is stationary just above the slide while the slide moves freely beneath it. you really cont go wrong with any of them.
I've never read too far into canyon creek so I cant really answer for them.