Spanishpilot,
This subject has been discussed thoroughly...indeed search machines can hardly cope with this subject...as our friend mentioned above.
If you want my opinion airlines are looking for skills, professionalism and motivation whatever the training method. 95% or so of current airline pilots are modular simply because very little have 100000 euros to spent at once...while training on a full time basis...and without a secured job as First Officer anywhere. However if you are looking for a career as an airline pilot as soon as possible and money is not a problem then go for a reputable integrated course! Through an integrated course usually you get the minimum required training for an ATPL frozen in a short period of time but in a well structured airline orientated way...Airlines tend to like intergrated courses basically because modular training over a long period of time is associated with a big risk of accumulating all sorts of bad habits...in the way you act as a pilot I mean...
Whatever you choose...buena suerte!