Student or Learner
Are there any difference?
He is the photographer who took this picture.
He is the photographer that took this picture.
Please help me!
And many of those that prefer 'who' tried to make it into a rule, that rule being that only 'who' is used for people which, as Proesl has pointed out, isn't a rule.
As to which is used more often, if I'm not mistaken, the LGSWE notes that 'who' is used much more often. [my copy is many miles away at present]