Reply by Joo from Toy-world.com.hk, gotta thank him for the detailed comparison and explanation on why he changed the body.
The joint of the hand is a little bit loose when using in HT's body
Here are the comparison and hope you can see the different between two bodies,
For position A
you can see the shoulder of HT's body is a little bit wider than SS's body
and it make the overall outlook of the neck, shoulder and head is more better than the SS's one (In cantonese, we're calling SS's body A字膊)
SS's body make the neck + head seem to be a little bit shorter when wearing the clothes
At position B
you can see the elbow joint of HT's body can keep closer to the body
and so it can make a more nature posing when comparing with SS's body,
here are the picutures showing how it's better