Which is the best way to turn off a motorcycle by using the kill switch or by turning the key to the off position?

As far as I know, there is no noteworthy difference in the way most bikes stop either by using the kill switch or the key. The engine's ignition gets cut either way and as far as the engine is concerned that's the end of it. On practical grounds, however, there is something to be said for using the key: it's a good habit to acquire, for using the kill switch might lead to forgetting the key in/on, straight to a lost/stolen key/bike or possibly a flattened battery. Also, once used, one tends to forget the kill switch on "off", prompting a few moments of confusion when the bike is to be started again...