We went with the sled based chairs.
Thanks to those who left comments!
Originally I thought I would choose black, as it would stain less and match the desks. Then I thought, "Hey these are THEIR chairs and who cares if they are covered in marker in year." They are going to spend a large majority of their time in them so I thought it best to let them decide on the color.
Little girl went with red. And the boy went with sunset (orange)
It's a good thing I got the order in today. I just received an email that the desks have been shipped. Which means they will be here on or before Monday. Woohoo! Which means I need to finalize the cleaning project.