It is very true that a more intensive course (at the beginning of doing circuits, 40 minutes at a time will be enough to frazzle your brain!) will get you a PPL with less training time, so will cost less money.
However, it is worth thinking about what you are going to do with your PPL after you finish the course. If you then have no money left after the short course and don't fly again for months, you will forget what you have learned as quickly as you were taught it. You will start to forget about that flying dream and you'll quickly start to drift away.
If you plan on being a hobby pilot I suggest that doing a longer course can embed the knowledge more deeply, and you then get used to a certain level of regular expenditure which is easier to keep up once you've qualified. Very different if you have a particular purpose for learning though, such as trying to become professional or perhaps even commuting...