It is impossible to say who was better, but in my opinion Schumi would have to edge the great Brazilian as Michael Schumacher was a complete package, he could rally his team around himself like no other. Remember its a team sport. The pit-stops, the strategies with Ross Brawn & Jean Todt, designing & mechanical inputs to Rory Bryne and finally his unmatched racing speed and overtaking ability - they would all set him a class apart. Aryton Senna's legend will live on forever and Michael Schumacher's records may never be broken. We haven't been blessed with the most titanic rivalry of all.