I got my Supcase yesterday and I'm still using the Spigen one, even with the buttons.
The supcase looks great and feels good in the hand but the buttons are really hard to press and because of the shape of the case for added grip, the phone wobbles from top to bottom when you are trying to use it on a desk.
Really annoying and ruins an otherwise excellent case!
So the long and short of it, even with the too easy to accidentally press buttons the Spigen is the less annoying of the two cases and has the kickstand.