I kinda of ignored aesthetics and moves I like to use and went for the bigger picture:
Hadouken is probably my favorite move in all of games, despite not using it often in SF. It's just what it is, what it represents. Pure martial arts power that is an energy blast.
Hadouken is SF. Same reason I love Ryu despite finding him fairly boring in SF.
Bad Stone is the hadouken's polar opposite. It's cheap and dirty, literally street fighting rather than classic SF's more organized/sportmanshipy martial arts. Also thrown very nonchalantly. Feels so satisfying and so smug to deflect hadoukens using it or even beat an enemy who's just standing up.