In both of those examples, the correct word is "Whatever". "Whatsoever" is used after a negative phrase to add emphasis to the idea that is being expressed, for example: He has no respect for authority whatsoever. I can honestly say that I have no interest whatsoever in the royal family. There is no evidence whatsoever to show that this is in fact the case. "Did you have any idea what was happening at the time?" "None whatsoever."

Hi Ivan, In your examples, the structure calls for using just the word any: "You can make any decision you'd like" "You have to choose a color. Any color is fine." Whatsoever is pretty much the same as "(any) at all" in the sense of "none". For example, "I'm not using any toothpaste whatsoever". It's there for emphasis on a negative sentence.