As long as you are killing elites, I find nemesis to be stronger, but I think it's close enough to vary from case to case depending on gear, para, exact settings etc.
Once you start ignoring elites (84-85+), you'd want to switch out nemesis for strongarms, and sunkeeper for swiftmount. Also you'd probably want to set up proper avoidance settings at that point.
Can you please write avoidance settings for pushing?