Regardless of with whom, I recommend not using the same service you host with or use for development. Don't place yourself in the position to be held hostage -- whether deliberately or through neglect.
Some services allow you to designate another account as an "administrator" without giving up your control over the domain's ownership.
That said, don't forget to renew your registration! You are going to want to whitelist messages from whomever you register with.
This may vary with a more substantial presence and formalized agreements beyond random user account boilerplate.