Orientation is more important the stronger el Nino is...seasons that feature weaker and basin-wide events are predominantly dictated by extra tropical influences. Def. NOT black and white...that thought process is too "reductive", as @brooklynwx99would say. Its the seasons like 2009-2010 and 1997-1998 that can independently bias the seasonal pendulum to one extreme, so to speak.
Think of ENSO as an orientation-intensity continuum.....the stronger and more biased to one extreme in orientation, the more influence the tropics have on the extra tropical hemisphere. Weaker and less biased in orientation have reduced proxy as it relates to the extra tropical hemisphere.