different between cortana vs alexa

cortana

cortana From the web:

• what cortana means
• what cortana do
• what cortana is used for
• what cortana says
• cortana what song is playing
• cortana what exactly am i looking at
• cortana what time is it
• cortana what if you miss

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alexa

alexa From the web:

• what alexa can do
• what alexander the great looked like
• what alexander graham bell invented
• what alexa and katie character are you
• what alexa do i have
• what alexa should i get
• what alexander hamilton a president
• what alexa do