There are both risks and benefits of each.

A motorcycle can travel at "traffic speeds" in the middle of the lane, and thus at less risk of being rear-ended. They are also required to have better lights for visibility. Being larger and in the middle of the lane, they are probably also somewhat more visible, and less easily ignored.

There still is some risk of being sideswiped by inattentive drivers, or T-Boning drivers that pull out in front of them.

The biggest difference, however, is that wrecks are usually far worse on a motorcycle due to higher speeds and a heavier vehicle.

How does one count insignificant "wrecks" on a bicycle? Tipping over, getting a wheel stuck in a crack, whatever, as well as those group ride accidents.