I suppose that the theatrical apex for acting roles would be something like Hamlet in a lavish production. The equivalent in movies could only be that of James Bond. Not only is the actor assisted by ridiculously high budgets, he is guaranteed a success as around a billion eyeballs will watch him with interest and is assured of instant immortality as I suspect that nobody will ever forget the character of James Bond. The following is a list of actors who have portrayed Bond in my order of preference.
The man who made the role his own, Sean Connery was chosen by the director of the first movie (Dr. No) in the franchise, Terence Young, primarily for his swagger. Connery is the quintessential 007 and there really can be no question as to whether he was the best Bond.
I have Lazenby up here more out of sympathy than anything else. But that in itself does a disservice to the man as he did a creditable job in OHMSS and the movie on the whole was a good watch.