I prefer the center of the lane. Lane placement best communicates your intentions to motorists. Anything else may leave motorists wondering what you are doing, turning, waiting to move into the flow of traffic, taking a break from pedaling... Unless you have turn signals and brake lights most modern motorists have no clue what you are going to do. Many young drivers have no clue what hand signals are or how/why they war used because their ride came with brake lights and often unused turn signals.