The Playmates line is awkward but believe it or not the old school Star Wars figure stands give the Playmates line added stability and they are somewhat discreet when used for that application.....
As for most modern, boutique-style figures, the NECA stands do pretty well for making a solid platform. The only problem with the stands as circles is that they don't fit into square display applications.
I hope that helps. Take the images as photographic proof of the applications.