Horses for courses. If you are riding around town in the Netherlands a Durch bike might be more fun due to the lower average speed, better bike infrastructure and having loads of other cyclists to look out for. In London a single speed similar to a track bike is probably best because you need to go fast all the time but don’t often need to worry about hills, in San Fran get an e-bike, in Sydney just get a cab so you aren’t vehicular homicided by a bogun