Then, there are those rare schools that place nearly equal emphasis on both aspects. Attend class as a guest or visitor. Most schools welcome visitors. It gives the students a chance to demonstrate knowledge and training. Pay close attention to the instructors.
Individual students respond differently to training techniques.
Only you can determine what atmosphere would be best for you. Interview the Instructor. Make them sell you. Beware of instructors who approach you with a contract in hand. First, ask them about the martial art they teach and their qualifications as an instructor.