I taught in China for 7 years.

Training schools seem to have more focused and willing students who have actually given of their own money and free time to learn. Their curriculum, while often far from perfect, at least follows a recognised pattern of language acquisition and logical sequence of grammar and vocabulary building.

Universities, on the other hand, seem in general to have no purpose to their English classes other than to fill gaps in timetables and provide the compulsory X hours of English language to classes consisting of 95% uninterested students. Teachers are told to do what they like as long as every student receives a pass mark at the end of the year. The classes are unmonitored in terms of content, attendance, test and exam content and marking. Many of the teachers are illegally working at different schools of this type as they know the demand for foreign faces by far outweighs their linguistic and teaching ability. In most cases they are also keenly aware of the aforementioned points. I would hasten to add that some Universities are not like this, but from my experience and from talking to others who have worked in them, I'd guess roughly 90% are of this type.

Overall I'd say that training schools offer students far more than colleges and universities. They have smaller class numbers (typically 4-16 as opposed to 30-60 in universities), so their teachers actually know their names, are aware of their deficiencies and able do something to help them improve. A reduced student/teacher number allows teachers to better monitor pair and group work activity and improves STT.

On the other hand, Universities do offer foreign perverts the opportunity to get hugely naive Chinese girls drunk and [edited]. I guess it's all a question of ethics and your reason for becoming an English teacher in the first place.