I think this depends on what application you are using.
when I started using a new application on windows, we (at least I) as the first thing,definitely go to help and search for the keyboard shortcuts.
gmail, outlook are two of them.
if there is something mouse equivalent with keyboard for any application, we would surely prefer to use that. so for me, its keyboard.
on the other hand, for terminal, no doubt, vote for keyboard.
Also no doubt, we used mouse for voting :P