It's all been said. There is no optical difference. Slobodan posted you the spec sheet links.
As long as the glass is in good condition, any version should be fine. There is no in-lens shutter to worry about with the F lenses, so there is nothing to wear out. All you have to worry about is physical damage to the front and rear elements, and possibly fungus. I have a 49 year old C lens which is still going strong.
John