Team accounts allow billing and administration for your whole team. Users you add to your team will be billed together and can all see and pair with each other. To join an existing team, you should get an invite from an existing user instead of creating a new team. If you think a team exists but don't know whom to contact, reach out to email@example.com and we can help hook you up with the right person.
Freelancer accounts are for individuals who want to pay for themselves instead of being part of a team. With a Freelancer account, you can invite and pair with as many people you want, but those you invite will only be able to pair with paid users.