Some good advice here. And I think it can be summarised quite simply.
The flying organisation must be prepared to do 100% for the students. If that's the case, it doesn't matter whether it calls itself a school or club.
The instructors must be prepared to do 100% for their students. If they do that, it doesn't actually matter how many flying hours they have, how many of them you fly with (within reason!), or what job they plan to have next month.
All of the above must expect 100% from you, know you're capable of it (very important for the under-confident), and you must be prepared to give it.
There is no place for second-best in aviation.
Visit several organisations, talk to instructors and students, maybe have several trial lessons. Then - and only then - should you decide.
However, if one place and/or instructor really, really grabs you, go for it. Gut feeling always has a place in aviation, and can even save your life...but that's another subject.