An incomplete answer:The Wiktionary defines choice as:
choice (plural choices)
- An option; a decision; an opportunity to choose or select something. Do I have a choice of what color to paint it?
- One selection or preference; that which is chosen or decided; the outcome of a decision. The ice cream sundae is a popular choice for dessert.
- Anything that can be choosen.
- (definite: the choice): The best or most preferable part
And decision:
decision (plural decisions)
- A decision is the commitment to irrevocably allocate valuable resources. A decision is a commitment to act. Action is the irrevocable allocation of valuable resources.
- A choice or judgement. It is the decision of the court that spoiling the endings of movies is protected as free speech.It's a tough decision, but I'll take vanilla.
- Firmness of conviction. After agonizing deliberations, they finally proceeded with decision.
- (boxing) A result arrived at by the judges (cf.knockout) He has won twice by knockout, once by decision.
Etymologically speaking decision may come from "dic-" meaning to talk or declare and "-cide" a suffix meaning to cut. I am unsure about the formers root. It seems though they may both be used synonymously though decision may seem more bold.
I just want to point out that "choosen" is not in any of the dictionaries I have.
