I like to travel with bus only . As , it takes to time to reach stations & thus , I have more time to travel .
If price and time of arrival was not of concern, I would stick to taking the train. The bus can be fun, but try sitting on it for 48 hours straight (the odd 5-10 minute stop, no hotel stop...ugh) and it can be a little miserable, especially with the annoying transfers in Montreal, Ottawa, Toronto, etc - the train is obviously pretty safe, and comfortable if you get the right room - never had a pool room, but it'd be cool to play pool on the train.
It's depend on distance. Plane :Long journey from one country to other country. Train :journey from One city or state to other city or state. Bus : college or school or others.
i travel by train as its fast locally, its certain i would love to fly by plane or chopper though you need that kinda cash to afford it, i travel by bus at times too.
If there's an option to select among those 3 to travel to one place, I will still go for train. Plane is off for me because it gave me the jitters while bus can be stuffy at times.
I think you forgot to add CAR . Here in US we use cars a lot to travel. I know in India people use Buses