First off you need to recognise that One Plane Swing/Two Plane Swing is highly debatable to begin with, it is at best, the newest explaination to why golf instruction is failing, ie...people mixing and matching fundamentals of the two, and the fundamentals are slightly different, mostly in address and grip, starting the backswing.

My view is that One Plane Swing/Two Plane Swing does exsist, however it is largely based on your body type and setup at address. Taller players tend to be (remember I said tend to be, not set in stone) 1PS because they bend over more, shorter players 2PS because they are more upright. Once again I will say, this is MY VIEW, you WILL get arguments in this area of the golf swing. So having said that, in my view you need to determine which you are and stick to the fundamental of that style, you will progress much quicker. Just my opinion.