You would have to define "good"?
Most people only have experience of the FTO's they have chosen, and therefore it is difficult to make comparisons with an organisation they haven't used.
There is in fact plenty of information on these forums of individual organisations, that should help as a part of your research.
What is it you want from a training school? Does it have to be near where you live? Is cost a major factor? What do you expect after you have accomplished your training goals? Whilst there are certainly a few "red flags" out there, the majority of schools that have any reasonable history and longevity, are likely to be satisfactory within a broad spectrum of satisfaction. Those aspects that make one particular school "good" are also likely to differ from one person to the next.
If you narrow down the criteria that is important to you, then you should be able to arrive at a manageable number of potential FTO's that are then worthy of a visit, so that you can get a feel of the place and talk to people who are training there.