Air Coach or City Link

We used Air Coach from Dublin airport to Belfast, then to Galway by way of Dublin airport. Also used from Dublin City Center back to the airport. Very easy, comfortable, affordable, and reliable.

If both are an option for where I am going, is one better than the other?

Care to tell us where you are going?

I am always surprised at how everyone talks about these private companies who have cherry picked the best routes. No one seems to consider Bus Eireann (the national operator) or the Translink route to Northern Ireland.
It seems that advertising pays off.

Bus Eireann were too slow to capitalise on the improved road network in a lot of cases. Private operators could be seen heading down the motorway to Galway for years while BE vehicles continued trundling through towns and villages on the old road.