What are the differences between mid-size and "factory" size clinics?

[pinkdaisyz]

I see a lot of people talk about this online but I want to get an idea of what the key differences are. Like for someone looking for a mid-sized clinic, I see a lot of mentions for NOTE Plastic but when it comes to larger clinics, often refereed to as factory size or just factory clinics, people mention AB Plastic or JK Plastic. Can someone explain what the differences are outside of the size? Are there any costs differences? Is one better than the other for foreigners?