sanderling or semipalmated sandpiper

Took this image several years ago in Rhode Island. My initial identification based on the leg color and the supercilium was Semipalmated Sandpiper. But the more I look at it I think Sanderling due to the color and pattern in the plumage on the bird's back.

I'd like to hear the thoughts of others on this. These are two birds that I routinely get confused with each other.

Thanks

Young Sanderlings, note the spangling on the wings, light cheeks and clean white breast. The image seems to have a touch too much contrast/saturation and that might not be helpful for ID purposes.

They're Sanderlings, Nick. The bird at left showing the nice head profile shows the white head (whiter than any other shorebird) and fairly stout bill of a Sanderling. The next three birds to the right show the longer primary projection, extending well past the tertials, that helps differentiate the medium sized peeps (Sanderling, Dunlin, Baird's, etc) from the small peeps (Western, Least, Semi).

edit: oh, and the bird preening shows the black shoulder patch which is also a good mark.

Thanks Brian and Mia. I appreciate the help. The more I looked at the photo and consulted the guide books I leaned more towards young Sanderlings.

And you're right about the contrast and saturation Mia.....thanks for pointing that out.

Pixel peep and see if there is a rear toe on any of those feet.