A shimano 11-34 has poor sprocket spacing. On a road bike, I'd hate 11-13-15-17...

I use a 48/32 with Campy 12 11-34, but I'm 67 years old and ride in the foothills and mountains of Colorado. On more moderate terrain a young fit person would probably use a 53/39 crank and 11-25 cassette.