Hardly a ringing endorsement of your "often cheaper" assertion if you have "flown twice" and "once" it was cheaper and the second was 25 quid more.
I would dearly love to use BFS however the combination of higher expense and the often long lines at immigration in the USA works against it. The single North American connection on a narrow body also does it no favours.
Dublin is cheaper,more choice,and I can clear immigration before I leave. That lets me get a tighter connection home.