Tigerair or Murrays Coach? Travel between Canberra and Melbourne, bus or plane? Which one's better?

Murrays Coach recently added a direct service between Canberra and Melbourne for as little as $20. The bus departs daily and the trip takes around 8 hours. Tigerair is a budget airline in Australia. The flight between Canberra and Melbourne is around 50 minutes to 1 hour, and costs at least $87.
I'm going to fly Tigerair TT663 from Canberra to Melbourne, then the next day I'm gonna take the 9 o'clock bus back to Canberra.
So let's see who's the winner, Murrays or Tigerair?
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