Config, there are only a few truly "bad" schools which you should probably avoid at all costs. You can find out which ones they are by researching on the archive for this forum - your question has been asked before many, many times.
The bottom line is that different schools are right for different people - if you want fast and cheap training you will not go to a school where training takes longer and costs more - obvious, right? But in that case you shouldn't expect the training quality to be quite the same. The fact that a bottom-tier and a top-tier FTO provide training towards the same licence is about the only similarity between them. There's no magic formula why some places are much cheaper than others - corners have to be cut to be cheap.
You need to decide what you actually want/need just as you would if you're buying a car. You can buy a Fiat or an Audi, they do much the same thing - get you from A to B - but an Audi buyer won't want a Fiat and a Fiat buyer won't buy an Audi for a number of reasons.
In that sense: EFT offers a product with which many people who go there are happy whereas others might not be - but that's the case at any FTO.
Yeah,
KK