TNG: Probably 'All Good Things'. Also partial to 'Darmok' and, yes, 'The Inner Light'...'Chain Of Command' is strong too for that matter. Basically anything where Patrick Stewart gets to do lots of acting.
From a Riker fan point of view there's 'Best Of Both Worlds' and 'Frame Of Mind', of course. TNG ruled, basically.
DS9: Well everyone always says 'In The Pale Moonlight' but that's because it's REALLY FUCKING GOOD, so probably not. And 'What You Leave Behind...' was a great finale though the Bajoran religion stuff was never entirely satisfactory (but Dukat turning Cardassian and evil again ruled.)
AND HOW ABOUT 'IMPROBABLE CAUSE'/'THE DIE IS CAST', YA CUNTS?
VOY: Umm, 'Living Witness' in the only one that's TNG level goodness. Like the one with the dinosaurs too.
FUCK ENDGAMe.