You should think about which of the linux courses is going to be the best for your needs, which includes any future goals you have for your career. You should think about what certifications you already have and which tests you would need to take. This would help you to choose the class that would meet your needs and the requirements.
Look at the topics that are going to be taught during the duration of the class and which company is offering them. The price that you are paying should include the cost of the test and the tuition.