Think they are both great. Heard a story that Bon Scott had randomly gone to see the band that Brian Johnson was fronting one night. Bon apparently went to see different bands all the time and his review back to his mates was typically the same- not impressed. He cam back from seeing Brian Johnson's band and was lavish in his praise of Brian. 'Guy way rolling around on the stage screaming- never seen a showman like that'. As it turns out Brian had an appendicitis and was shrieking in pain. May have won him an epic gig as after Bon passed they thought of Brian.
Partial to Brian only because of the family connection for "Shoot to Thrill"
When my boys started hockey they played outside on inline roller skates and that was the song I always queued up in the car as we approached the rink from a distance. Pretty cool with it playing in the background as the rink lights would come into into view from the mist/fog down by the ocean.
Saw Bon and AC/DC in Nurenberg, West Germany, on 01SEP79. Awesome set. Highway to Hell Tour. He passed not long after. Bought an AC/DC T-shirt there. My Mom threw it out a couple of years later.