Martial arts classes tend to offer a variety of options aimed at different personalities and preferences.
Individual systems and styles are favour certain training methods.
Most classes teach a workable system.
Which approach is best?
It all depends on what you want.
A person who enjoys fighting will choose a class that focuses on fighting.
Someone who wants to finish the fight quickly may select a martial art that focuses on incapacitation.
Another person may choose self defence because they have no interest in fighting.
Which approach works best for you?