Integrated is full time, all hands to the pumps training which takes just over a year. Modular can take as long as you want it to be. I heard a guy did it all in about 7 months if you go at it hammer and tongs. Of course, that might affect the quality of your flying at the end of it, better to have structured breaks and do it at your own pace - people also have other commitments so might not be able to put themselves on an intergrated course.
I never understood why integrated is more expensive when you do less hours
Horgy