Some say location location location. But be careful. Those who say iit isn't are somewhat misguided. Lets take the extreme. You go get your JAA from some out of the way minor european state and compare that to a JAA from a more informed and reliable JAA state. I know that more consideration be given to someone who has obtained it from a more "reputable" authority.
However, so now you choose a "reputable" country to do your JAA licence. The difference between the schools in that country offering this is minor. The different schools wont really matter to the airline. But the reputation of that countries CAA is what counts.
There are even more twists. Some airlines go to different schools, cabair, oxford, CTC MacAlpine etc. So dont go by the principle that because and airline is usin a school and not another that it's any better than any other school. These contracts are awarded to schools for many many reasons, not just because of "reputation". So all the schools can get your licence and all the schools will put you in a similar position to get that elusive job.
What the decision should be based upon for you is customer care (talk to students), location (it is easy to get to?, living costs? etc), time taken (can you quit your job, can you afford to?) and money, and if you want to start a war talk about pass rates as well. Can you afford it and have you got the time will all dictate either a modular route or intergrated. That descision will automatically start to short list the available schools.
It has to be a personal choice and this issue has been thrashed about on this forum for as long as this forum has been running.
Good luck, and please, this is an opinion, i dont want to start a war.