Automatic Updates: the torbrowser-launcher Debian package vs. Tor Browser Bundle?

From: https://wiki.debian.org/TorBrowser

The advantage of using torbrowser-launcher over the manual installation of the TorBrowser package (called Tor Browser Bundle) is threefold:
You will benefit from automatic upgrades

What is the difference between torbrowser-launcher’s automatic upgrades vs Tor Browser Bundle’s automatic upgrades?