The fact that 75% of new FO's are from integrated schools is nothing to do with the quality of the pilot, and everything to do with the fact that the schools have contracts with all the major airlines to provide a proportion of their new pilots, and the airlines can offset huge amounts of money against tax for training purposes when you come through an integrated school which is registered as a learning establishment.
The cold hard facts are that it is in the interest of both the integrated schools and the airlines to take on integrated pilots for these reasons, it has absolutely nothing to do with quality of pilot. Why else would the integrated schools be able to charge £70k+ for a set of licences which will cost you almost half that if you did a modular course?!
At the end of the day you pay for two things when going integrated; speed, and contacts. If you have the money to pay the premium then go for it, but dont kid yourself that it has anything to do with becoming a better pilot