If you listen to the evolution of Ernie and Kermit over time, both appear to gradually get closer to Jim Henson's natural speaking voice (and thus increasingly like each other).
However, if you go all the way back to the beginning and listen to the first Ernie and Bert sketches, it becomes clear that the gruff (angry-looking) Bert was intended to be a kind of "Ralph Kramden" clone, with the serious attitude, and Ernie was a complementary "Ed Norton", with a more carefree, zany outlook and mannerisms. I suppose the Honeymooners was the standard model at the time for what the "urban comedy duo" was supposed to sound like.
(If you aren't familiar with the Honeymooners, you could also compare the voice of "old Bert" to Fred Flinstone and the voice of "old Ernie" to Barney Rubble...)
While Ernie gradually trailed off toward Henson's natural speaking voice, Oz latched on to the idea that Bert was supposed to be really boring and appears to transition from a Kramden voice over to a more generic "nerd" voice.
However, if you go all the way back to the beginning and listen to the first Ernie and Bert sketches, it becomes clear that the gruff (angry-looking) Bert was intended to be a kind of "Ralph Kramden" clone, with the serious attitude, and Ernie was a complementary "Ed Norton", with a more carefree, zany outlook and mannerisms. I suppose the Honeymooners was the standard model at the time for what the "urban comedy duo" was supposed to sound like.
(If you aren't familiar with the Honeymooners, you could also compare the voice of "old Bert" to Fred Flinstone and the voice of "old Ernie" to Barney Rubble...)
While Ernie gradually trailed off toward Henson's natural speaking voice, Oz latched on to the idea that Bert was supposed to be really boring and appears to transition from a Kramden voice over to a more generic "nerd" voice.