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After 50 million miles, Waymos crash a lot less than human drivers
(arstechnica.com)
This is a most excellent place for technology news and articles.
In terms of getting to an exact location, the most efficient is no vehicle, walking.
Cars are less efficient, followed by busses, then probably trains, then boats, then airplanes (unless you parachute).
Cars are the least efficient in terms of moving large numbers of people from places they can then walk from.
The most efficient is obviously a combination of methods, using the fastest methods for each leg of the journey.
In the US, right now, taking a car from point to point, then walking into your location is the fastest combination in most cases.