Depends on who you like but I think the den-o forms are better built.
And yeah my collection pieces are wearing the special metallic armor from this:
http://img.photobucket.com/albums/v320/revl89/IMG_0429.jpg?t=1233436338
It looks better in person without the flash. It makes them look completely metallized as I'm sure those with den-o SHs know they look mettalic at the helmet and the thighs.
And Come this week or next I should have a completed ryuki sh set.