I am a huge AC/DC fan. I'd have to say that is a difficult question. Bon was with AC/DC for 7 years, and Brian has been with them for 29 years and counting. Bon and AC/DC have written great songs together, and some that are Australian exclusives, but Brian is a good frontman with a good voice, which is known on the Back in Black and Stiff Upper Lip albums. To make a long story short, I'd say Bon was better by a little bit. I recommend the If You Want Blood You've Got It live album, not the song
Saw them live 2 weeks ago and they were amazing. I have footage from the Bon era and it was crazy! I'd like to go with my personal experience though, so live I go with Brian Johnson since I saw it in person.
I love Ac/dc and they both rocked..... but I'm gonna have to say Bon Scott even though Johnson's voice is more powerful Scott has better range and is easier to understand :P