I grew up with AC/DC with Bon Scott and could't get used to the voice of Brian Johnson (great guy by the way) at first but that album grew on me too, it's great but just like High Voltage more. There's also the raw sound of the older AC/DC albums that I prefer over their later albums.
It's interesting topic. To be quite honest, back in the 70's...I just wasn't familiar with AC/DC or Bon Scott. I remember towards the end of my sophomore year of high school, which is when the new and improved GOS emerged (party animal), I began to hear some rumblings about the song Highway To Hell...though I just had no history with AC/DC and well...my folks were super religious back then and there was no way I would be able to buy that album, or play that song in our house.
Then, when Back In Black was released, apparently AC/DC were making a HUGE push to tour every state in the US....as that was first time I saw them during BIB tour in Horton Field House, Normal, IL. AC/DC during 1980/1981 were a HUGE, HUGE band for us at our parties....and everyone who was anybody had BIB playing in their car. It was larger than life I think. Still, I was not even familiar with the story of Bon Scott....but once I got out of high school, I came to realize that all these older albums were AMAZING!!! But with a different singer. For me, the rest of the story is history as I obviously pursued buying every damn AC/DC I could find with Scott....