It could be argued Hot Toys looks too shiny, Sideshow not shiny enough.
The Hot Toys helmet appears to be too long vertically? ..Sideshow got that right.
The red line on the Sideshow cloak looks shiny?
Actual metal might offer one solution
Hot Toys 1/6 vs Sideshow 1/4
Star Wars - Captain Phasma
This takes me back to R2-D2 1/6th scale. The Hot Toys dome looked too shiny and was made from metal.
The Sideshow dome lacked shine and was made from plastic.