For online services handling economic transactions, which login method has the best conversion rates:

  1. Username/e-mail and password
  2. E-mail/phone-number & a link sent to the user (like Swedish Klarna https://www.klarna.com/se/) does?

Does anybody know of research or studies regarding this? What are the results?

  • I'm voting to close this question as off-topic because it's essentially a survey. If you rephrase it to ask a question specifically rather than ask for everyone's opinion on their personal preference, it may be on-topic and could be re-openend. – JohnGB May 6 '15 at 11:57
  • Is he not asking for research study backed information? – DarrylGodden May 7 '15 at 8:47
  • Yes Darryl, I have now updated the question, to be more focused on facts, and less on opinions.. – Tobias May 7 '15 at 11:53

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