There are many good schools in the UK and overseas. Those that specialise in integrated courses will recommend integrated to you, and quote unsubstantiated arguments that 'the airlines prefer integrated graduates'. Those that specialise in modular will put forward equally strong arguments that modular is the way to go.
Well, let's get one thing straight: there is no inherent advantage in an integrated course. Airlines have no real interest in how you obtain your licence beyond ascertaining that you did it legally and through a recognised school. Don't be swayed by implications at certain symposia that some airlines might prefer graduates of certain schools. For a start, the airlines making these suggestions are not recruiting - now or in the near to medium future. Secondly, there is no evidence that these suggestions are true - but the mere suggestion might benefit one or two schools!
There are still one or two old sweats in the industry that equate integrated with the old, and then-preferred, 509 course, and modular with the self-improver route. There are some in the current school system that would rather these old sweats were not disabused of their misunderstanding!
So, what's the answer? Basically, it's entirely down to your personal circumstances. If you wish to go from zero to fATPL in a year to 18 months, and you have a spare 60,000 quid (or more) available, then integrated may be for you. If you need to keep earning wherever and whenever possible while taking extended breaks to further your training, then modular is the way to go.
There are 'enhanced' integrated courses available through the major schools (for another 20K or so!) which claim to prepare you more thoroughly for the transition to airline employment. As yet, I've seen little evidence of their efficacy, and the schools aren't exactly trumpeting their long list of successes, so the jury is still out on these as far as I am concerned.
Before you start any training with any school, go and get yourself some flying experience to see if you really do like it as much as you think you will, and get a Class 1 medical. I recommend you also do a GAPAN aptitude test (I believe Cranfield offer a similar one) to see if you're likely to fail through terminal lack of co-ordination or not!
Lastly, don't sign up for any course that requires you to pay up front. Ensure that they either accept monthly payments (preferably by credit card) or operate an 'escrow' account which keeps your money safe in the event of their going bust. Talk to students of your chosen school(s); see what they really think of the place that's taken all their momey - too many schools are very cavalier in their treatment of their customers.
Above all, remember to have fun and enjoy it!
Hope this helps!
Scroggs