Everyone has their own "entry point". Maybe you overdo motivation so you focus on discipline. Maybe you overdo discipline so you focus on motivation.
Both are tools you use to apply to your own exact situation. Person A may vote for Team Motivation, because that works for them. Person B may vote for Team Discipline. That works for them.
The more accurate your self-knowledge and self-awareness, the more effective you can apply the tools (discipline, motivation, etc).
discipline is like keeping promises you make to yourself
and habits are just things you do cyclically and sometimes even without thinking but which you had to learn to do at some point (washing hands after using the toilet, brushing your teeth, etc..)
Making wanton sarcastic comments towards someone who suggested you may need therapy for something you're struggling with after you've stalked their account for other comments reads upset to me.
Both are tools you use to apply to your own exact situation. Person A may vote for Team Motivation, because that works for them. Person B may vote for Team Discipline. That works for them.
The more accurate your self-knowledge and self-awareness, the more effective you can apply the tools (discipline, motivation, etc).