I use both of these swing planes myself. I have spent hours upon hours learning both of these swing planes, firstly I used the 2 plane swing, but I could never hit my long irons straight, I always hit over the top and sliced them, the longer the club the higher it would go and the bigger the slice. I was getting good with my 8 iron to sw using the 2 plane swing. I later learnt about a 1 plane swing. I started to hit my long irons really good with a slight draw aswell as my driver, but as I got into my short irons I was getting really big hooks.

Now I use a 2 plane swing with all my short irons and a 1 plane swing for all my mid to longer irons and woods.