The reigning Driver's Champion is Sebastian Vettel and Red bull are the reigning constructor champions, but the number 1 formula 1 driver ever would probably be Ayrton Senna. Senna was the best but Micheal Schumacher would be the most successful.
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I personally think it is Michael Schumacher, because he won 7 F1 championships in 1994, 1995, 2000, 2001, 2002, 2003, and finally in 2004.