There are lots of pros and cons and the argument has been thrashed lots in other threads.
Money does not always buy quality. The best thing to go off are recommendations. A tin pot school with one aircraft and a very keen instructor can be better than a pilot factory with a high instructor turnover.
At the end of the day it is a lottery but providing you don't pay lots up front you can change schools if you don't like it. The hours you have done still count and you start where you left off with the last school.
The best reason for training on a fast US course is you get the licence. Lots of people give up in england after their lesson has been cancelled for the sixth time due to high wind, waterlogged runway, rain, cloud etc..
Whichever don't worry about it too much just bite the bullet and do it, enjoy it and join the club.