[Internet] What should I prefer Kontact or Thunderbird on Kubuntu 13.04

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http://www.kubuntuforums.net – I have Kubuntu 13.04 installed on my desktop. I am very much a newbie. I read on many websites that Thunderbird is better and more user friendly than Kontact. Like Kontact, Thunderbird also handles all tasks handled by Kontact. Can anyone suggest me, which should I prefer and how to configure them for 2 different emails(gmail and yahoomail) and how to set them as default for all tasks like feeds, twitter feeds, facebook posts and addressbooks, calenders, reminders, SMS, etc. (HowTos)