Depends. I prefer email because it feels less intrusive. Moreover it's easier to tag a URL in email. If you're going to have a call, you would anyways have to s

Depends. I prefer email because it feels less intrusive. Moreover it's easier to tag a URL in email. If you're going to have a call, you would anyways have to send them an email later on, with the link. Contrary to what I said above if you have good convincing skills, you should have a call first.