Which mysql storage engine to choose?

I'm confused about which mysql engine should I choose (lets talk about the most used : MyISAM and InnoDB). The theories say: - Both work with BTree indexes, but MyISAM can work with FULLTEXT index also. - InnoDB is more strict in data integrity while MyISAM is loose. - InnoDB has transactions while MyISAM does not. - InnoDB has foreign keys and relationship contraints while MyISAM does not. - MyISAM are faster to read but slower to write (I'm not sure about this one). When I create a table, should I always sacrifice something if I want to keep integrity and I want to speed up the query making search by "text"? How do you decide which engine to use if you need - integrity ? - speed ? - constraints ? - search by text ? - transactions ?