In essence, it all comes down to training. Those who are proficient on one, but not the other, dislike and disparage the other.
I grew up on steam, got taught ifr on old challenging approaches on steam driven partial panel. I also got taught glass by some very capable blokes who I hold in very high regard. It actually doesn't matter what you got taught on- all that matters is that those who have never driven the other should be taught the other!
I love glass and the information that it gives me without thinking, but crikey I love working out angles every now and then and hitting it spot on with Ye olde dials and gauges.