IMO the Butterfly is a newer car.
but trust me, you will later regret it, everytime you see a EG8 on the road.
though the EG8 is older. for me its a better car. the Mazda does around 10-12kml
and the EG8 will do around same. but maybe a bit less.
My Advice, if your going for a Civic. gor for a EFI one.