Keith,
I was mearly stating why Senna was my choice.
The question was not who was/is the best racer, the question was who was fastest over one lap, kind of like qualifying.
In the same car on the same day with the same weather....................
Senna out performed four time Champion Prost in poles 26 to 4<!-- google_ad_section_end -->
Now Keith had the question been who was the best racer, who had the best race craft, I might well pick Shumacher or Prost. But that was not the question.
Keep in mind that Senna spent time in Toleman and Slow Lotus teams and still got the pole in 40.37% of the GPs he entered!