In reply to Rollingthunder
It is worse to go off a RWY than a TXY because:
: The airplane is travelling faster on landing and keeps up speed to exit the runway while during the taxi fase the airplane is travelling slower thus causing less potential damage or injuries.
: when an airplace goes off the runway, the airport has to close that runway for landing and takeoffs.Closing part of a taxiway is far less disruptive to traffic.
As a side note : jet airliners are way less maneuverable at slow speeds and taxiways are way more slippery than runways when contaminated by ice , snow, and sluch.