I think the two most famous, (don't really know just going by anecdotal evidence), were your choice and The Flintstones.

I think my personal favorite was Top Cat. But WOW...tough choice.

In my family the favorite single cartoon voice was that of 'Droopy Dog'. Donald Duck amazed me and I had a couple friends who could to impressions of him very well. Foghorn Leghorn I liked a lot. Quick draw McGraw was another favorite... and I'll stop there not because I don't have others but rather to allow others to add their favorites. - JamesJM