I don't know the true operating costs of the Dash but if you look across the ditch that should give you a very good answer to which one is 'better'.
ANZ operates both types and has done for a very long time.
One of the largest oerators of the Q300 and undoubtedly largest operator of ATR72's in the southern hemisphere.
Which aircraft did they purchase in their latests aircraft purchase?
Speed for passengers isn't everything!
Price, comfort and service mean alot more.
Have people that bag the ATR actually flown in an ATR?
Quiet and comfortable, even more quiet than a B737 and A320 in my books.
The last time I flew on Q300 was not impressed at al,l I hope Q400 has improved.
Also which company has sold more aircraft recently?