My opinion is that the Jik-Chun or “Sun Punch” is stronger,, for these reasons… When using the horizontal fist you always use the first two knuckles or top knuckles of the punch… If you take your finger and draw a line straight down towards the wrist on the back of your fist starting from the second knuckle of the fist,, you will see that there is hardly any support from the wrist or forearm,, and by the elbow not being dipped,, there is no chum or sinking energy,, and the punch can sometimes be easily pull or blocked…
The Jik-Chun or “Sun Punch” uses the bottom 3 knuckles… The wrist must remain straight when executing the punch… When using the bottom 3 knuckles,, the top 2 knuckles line up automatically with the bottom 3 upon contact with the target,, when done correctly… If you take your finger and draw a line beginning with the 2nd knuckle down towards the wrist and straight down the forearm,, you will see that you have 10 times more support of the forearm and elbow by using the bottom 3 knuckles to line up the punch… That’s just my opinion and also the opinion of Woo Fai Ching…
Ali Rahim.
detroitwingchun.com