The Ang Khola will easily accomplish a chopping task faster than the CS because it does not get stuck. The WWII model performance is between the Ang Khola and CS in chopping. It gets stuck the odd time. I found front of the CS handle abrading against the tree. The rubber was starting to scrape away.
Bigger tree requires bigger khukuri.
The CS will generally out cut to HI models because of its flat ground blade. There is less metal around the edge to restrict penetration. The HI is sort of sabre ground. All three knives will cut well with the CS being the best followed by WWII, and the Ang Khola. Now my opinion.