Originally posted by mde1970 is it better to use in camera NR or will I get the same results in PP software?
You aren't going to get the same results in PP, because the in-camera NR is by dark frame subtraction, based on the sensor itself. If you are taking several exposures of the same duration you could take a single dark frame and do the DFS yourself; that way you would have only one extra interval to wait around for (plus more work in PP, of course). That's what astrophotographers do, because they often want a bunch of exposures at the same settings. With bracketing you'll have different exposure times of course, but a single dark frame might still work well enough.
On other other hand, PP NR may be good enough, and a lot less fuss.