These are my personal opinions based on my background and training experience.
To quote directly from their site:
The most trusted source for cyber security training, certification, and research.
It is SANS, do I need to say more? They have a lot of training and the classes I have taken have been worth the time and money (well, the money my employer at the time paid). Check them out.
Visit their main page at https://www.sans.org/ for more information.