I would still go ahead and say Senna is a better DRIVER per say compared to Schummie. But as a race driver, I would easily choose Schummie and Prost over Senna. Schummie and Prost were calculative and they knew very well how to take good care of their cars n tires and finish the races and WIN! On the other hand, Senna was just rash and to prove that point he held the maximum number of pole positions for a long time compared to the rest his records which were mostly broken by Schummie. It's hard to understand why Senna with 65 Pole positions won only 41 GP's. Qualifying as you know, you have a empty stretch of road, nobody racing with you, it's just about you and your Car. Senna excelled at it or rather was the best at it. But what he couldn't mange is how to nurse the car and win enough races. Schummie just has 68 poles but he was won a record 91 events and the great Prost, 51 wins from 33 poles.
I read a lot of posts before posting mine and I find it quite funny that most of the people say that Schummie always had a better Car. I would suggest people to know the facts and then comment.
Schummie started with Jordan, moved to Benetton, and in his first appearence as a driver in a full calendar year in 1992, he trumped Senna. Let's not forget that Senna's car had a much advanced V12 engines compared to Schummies V8.
In 1993 it was the great Prost who won the title quite comfortably in his Williams which was supposed to be the best package. It was so good that Senna actually agreed to drive a Williams absolutely free. You can't be seen driving in a Car which is not the best, can you? That thing alone says a lot doesn't it? Senna muscled Alain Prost out of Williams and took his seat just the way he used to take Alain out on the track when it mattered the most.. So even after this, in Williams, Senna could not muster a single point in the first 3 races in which Schummie won all the 3 and eventually the championship. Even after being the champ, Schummie could not secure a constructers for Benetton as Williams took it quite easily. Just to show which is a better car

1994, Schummie becomes the champ with 92 points and his team mate fetches Benetton a piddly 10 points.
1995, the year of Schummie again! He gets 102 while his team mate gets some 40 odd points
1996, moves to Ferrari and stands 3rd in the competition. Ferrari stands 2nd in constructers. Their best standing in 6 good years!!!
1991 - Ferrari - 3
1992 - Ferrari - 4
1993 - Ferrari - 4
1994 - Ferrari - 3
1995 - Ferrari - 3
1996 - Ferrari - 2 (Schummi 59, Irvine 11)
And the last time that Ferrari had won the constructors before was WAY BACK in 1978. So if anybody says that Schummie won as he had a better car, go get your facts right. Schummie moved from one worse car to another and made it better, made the car suit his team. Benetton was a mid runner, he won in it, left it to join Ferrari which was a mid runner, he won in it.

Now let's look at Senna. Starts at Toleman, jumps to Lotus. In 1987, figures out that he has no future in Lotus, announces in Monza that he is leaving Lotus for McLaren. In 1993, he felt that McLarens were less competitive compared to Williams etc. he decided not to have a contract with McLaren but drove McLaren's on a race to race basis as he didn't have any other contracts. Next he jumps to Williams offering them to drive for free and muscles Prost out of Williams.
Now please tell me, who had a better car all the time? Was it Schummie or Senna? It's quite magnamious for Schumacher to say that Senna is a better driver than himself. For me, I think that Senna was somebody very similar to Montoya when it comes to the driving style and the attitude. It's live for the moment and 'all or nothing' attitude which makes them more charismatic to watch. And as long as they do, it's fun to watch.
And let's not forget that Schummie was one of the biggest donors when Tsunami hit Sri Lanka and other countries in Asia. I know that he's not a great force to reckon with currently mostly cos of his age and probably the car he is driving. But never make the mistake of ignorning him.