Obviously, everything depends on the flying patterns.
I fly mostly transatlantic J, so my "how many flights do I need to become Emerald?" comparison would be like follows (assuming an average 10k miles per round trip):
BA Ex.Club:
800 points needed (not UK-Ireland based) / 240 points per round trip = 3.33 R.T. (I know for UK/USA it is much harder).
AAdvantage:
100,000 points needed / (10,000 x 1,5) = 6.66 Round Trips
IB+:
6,500 points needed / 800 (points R.T. average) = 8.12 Round Trips
So, who cares about IB+?