I don't see too many reviews like this, except at the tail end of videos. So this is dedicated to those who need side by side comparison to decide on a purchase. Check below for the pictures. Here are the comparisons Posing Though they can move around about the same, with some key differences. Siege has extra joints in the arms Siege has waist rotation, ER does not ER had a crotch flap but siege doesn't need one. Joints come loose on ER knees due to transformation. Siege advantages: Light piped head Waist rotation Jet mode no hollow area Jet mode robot form not obvious underneath Robot mode, back is detailed, no parts hanging Taller in robot mode Symbols show correctly in both modes Guns can stay on arms in both modes Earthrise advantages: Guns are better Has the earthmode Main body is thicker (is this an advantage?) Bigger alt mode Personally, the winner is Siege. But to each their own.