What he said....Without trying to be insulting, remember, you asked for opinions, I would rather have a good Ruger or S&W .357 Magnum than the guns you have listed.
Now, if my primary goal was to stay concealed, the Charter would be fine and I would be happy with it. The Sigma, not so much, but, for all practical purposes, theres nothing wrong with it either.
What are you trying to do with a .357 Magnum that you can't do with the guns you have?