McLaren Fan knows quite a bit, I remember asking him about which Senna biography I should get. He know's a lot, if you ever want to know something about F1, ask him.
Thank you. I'm flattered.

I don't know a lot about Schumacher books, but I know a little bit about Senna books and biographies. There is one which seems to sell well that was "written" by Tom Rubython. He basically plagiarised the whole book, for I think he was the editor of the official Formula One magazine, so nabbed articles etc. that other people had written and passed them off as his own. And you can tell, for most chapters feel as though they written by different people. As a lot of the book has been in articles, most of the material was already known, and some of it ended up being repeated from chapter to chapter. Rubython actually succeeds to make Senna look an inferior driver than what he was by running down Prost so much. There is a chapter with a grisly account of Senna's injuries and death, which was really uncalled for. I didn't see it coming,and, after reading it, I felt physically sick and had to put the book down. The only good thing about the book is that is fairly comprehensive, albeit almost to the point of being tedious.
The Death of Ayrton Senna by Richard Williams is a decent book. It doesn't have a lot of the information that "Rubython's" book does, but his analysis of Senna's character is much, much better. You see the good, the bad and the ugly of how Senna operated. Another author, Chris Hilton has a couple of books out on Senna. Many of them are old and the material is spread all across them. He does, however, have a relatively recent book out called
Ayrton Senna: The Whole Story, which brings the majority of it together. His writing style is also slightly less of an insomnia cure than Rubython's book, too. Incidentally, I think he has a book out on Schumacher, but I've not read it, so can't really say what it's like, but most of Hilton's stuff is pretty decent.
Overall, then, I'd say as a good general book to get you started on Senna that has all the key facts etc., I'd recommend Hilton's
The Whole Story.
Ayrton Senna: WDC 1988,
1989, 1990, 1991
McLaren: WCC 1974, 1984, 1985, 1988, 1989, 1990, 1991, 1998,
1999, 2007McLaren: WDC 1974, 1976, 1984, 1985, 1986, 1988, 1989, 1990, 1991, 1998, 1999, 2008