Sean - as I said elsewhere, he may have been a ladies man, but he also knew when to be cold & ruthless. Never liked Roger Moore's Bond (except for Live & Let Die) - View To A Kill was particularly embarrassing.
The party line is usually Sean... I was tempted to go with Roger, who was Bond during my formative years, but with the material that they gave Pierce, I think that Pierce has been the best.
I thought On Her Majesty's Secret Service was the best Bond film, but don't think Lazenby pulled it off that well. Probably Sean Connery, but those scripts seemed thin in comparison.