When creating a Swift_Message you can have both a plain text and an html version of the email. You set one as the body, and then you add the other one as a part.

What is the difference if I set the HTML version as body and plain text as part, and the other way around?

$html_as_body = Swift_Message::newInstance()
    ->setSubject($subject)
    ->setBody($html, 'text/html')
    ->addPart($plain, 'text/plain');

$plain_as_body = Swift_Message::newInstance()
    ->setSubject($subject)
    ->setBody($plain, 'text/plain')
    ->addPart($html, 'text/html');

And by difference, I mean what kind of difference will it have in email readers and such?

html swiftmailer plaintext
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