I would say London is more difficult because you have to be aware all the time, whereas in CPH you can kind of relax and actually enjoy the cycling element of it, taking in the sights. In London you can't afford to think about much but the traffic around you! Most of the non-cycling population's attitude towards cyclists in this country is appalling, which is quite sad really. Maybe if they had an inclination towards eco-friendly travel and exercise then 1/3rd of them wouldn't be obese.
I would say London is more difficult because you have to be aware all the time, whereas in CPH you can kind of relax and actually enjoy the cycling element of it, taking in the sights. In London you can't afford to think about much but the traffic around you! Most of the non-cycling population's attitude towards cyclists in this country is appalling, which is quite sad really. Maybe if they had an inclination towards eco-friendly travel and exercise then 1/3rd of them wouldn't be obese.