I ride where I am most visible AND where I have most visibility. I have done escort bike duty with the MOD in my time and that was all about being seen and being dominant. I prefer to be dominated lol
Best thing to do is to ride where YOU feel more comfortable and ride and YOUR pace. Some very experianced test/track riders I know are shocking on the road, right up cars bumpers, overtake anywhere etc. I'm slower on my bike than I am in my car!