I know several different pole methods from various styles, including both of these methods. The Tang Yik method has much more techniques and is a very long form. Yip Man's form contains only the bare essentials, but is enough in terms of combat if you're smart and can adapt. It's like asking what's better, the full alphabet or only the letters ABCD, at the end of the day if all the words you use only have the letters ABCD, then it doesn't matter. Personally the Tang Yik form is better in terms of being complete. I like the idea of Fok Bo Chuen incorporating the knives as it seems likely. Yes from my research Yip Man only learned the techniques as there wasn't a form to learn when he first learned it from Cha Wah Shun.