You only need the two main maps for Rainier, not the 3rd Paradise one (unless you really want it that is!)
Suggestion: Either coat them or keep them in a freezer bag. They are paper. I just fold mine and freezer bag.
They do show milesage nicely, by logical sections, making planning for easy. Elevation is shown as topo lines, with major landmarks having elevation posted (such as summits, passes, etc).
They are my favorite to use for the area. While the Nat Geo one is waterproof I find the GT ones to be a bit more indepth.
Though…it doesn't hurt to have both with you in the end – they do have different focuses.