Overall, most SP fans seem to work about the same regardless of whether they're in push or pull. Pushing through a Rad reportedly traps more dust in there, though I've no idea why, but that's why I opted for a pull out the top of my case.
Certain SP fans, such as Enermax ones, draw air in from the sides of their frames as well, so really only work in push.
Beyond that, it comes down to trying different configs out.
I'm still playing with my own, although I managed to take 5ºC off all temperatures over the weekend simply by modding the mesh side panel to a window!
You mentioned less RPMs - If noise is a factor for you, pay attention to what the airflow is blowing through - Even the quietest fans can make noise if they're billowing through a grille or mesh.