As weird as this might sound, it has been proved that air traveling is the most secure mean of travel or should we say, where there is the less problem.
Train and cars are the most problematic with accidents repetitively happening. The boat is a pretty safe option but plane is still ahead with the least accidents across all mean of transports.
The downside is that the plane is not green and probably one of the most polluting transport on a per passager basis where electric train are of course the best choice.
Green or not, the choice is up to you but with pricing going down and down on flights tickets, most people will probably go for the cheapest.