Using mixins versus calling a method directly

I would like to know when is the best time to use mixins against a direct method call.

For example, consider HTTParty. In one example, https://github.com/jnunemaker/httparty/blob/master/examples/basic.rb

you can use HTTParty.get ('http://twitter.com/statuses/public_timeline.json'), or you can create a class that includes HTTParty and then use it as you call HTTParty yourself.

What is the difference with me just by creating something like this:

class Partay
  @base_uri = 'http://localhost:3000'
  def self.post(endpoint, options)
    HTTParty.post(@base_uri + endpoint, options)
  end
end

in comparison with this example:

class Partay
  include HTTParty
  base_uri 'http://localhost:3000'
end

It is true that in such a trivial example, perhaps using include will save more characters, but I would suggest that in a much more complex class this really does not matter.

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