I've omitted the comparison of the transformation mechanisms for now.

The head height didn't change much.

The weapons on the backpack of the HGUC version were not articulated and were connected with polycaps.

The GQ version had a much wider range of motion, as expected from a latest kit.

Also, the mono-eyes of the HGUC version are all stickers, but the GQ version has all small pink mono-eyes, which I thought would be dangerous if lost.

Now that it's finished, I've compared them. | ハルぼん's Gunpla works