LAA - because most of the time I've owned a permit aircraft - although the politics of the PFA/LAA depress me beyond belief.
AOPA - not so long as the sun shines, there needs to be a massive change before it becomes relevant.
BMAA - I would join in an instant if they were an LAA alternative - proper grass roots flying with enthusiastic people.
PPL/IR - seem to be effective - particularly given their very small base - should/could be an example to AOPA UK.
BGA - again an effective organisation which works effectively for its members seem to work rather than politic - if only the LAA were as good..........