but is there any particular advantage choosing one provider over another?

Most importantly you should trust your OpenID provider. He can track your logins to SO, and if he decides to go evil he can log with your ID (without you ever noticing), and if he stops to provide his services, you're locked out.

So if you equally trust both OpenID providers, I don't see why you should chose one over the other - just go with the one you like better.

In reply to Re^3: Breaking Out of the Perl Echo Chamber (OpenID) by moritz
in thread Breaking Out of the Perl Echo Chamber: A Call to Action by Aristotle

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