
Bahamut |
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In terms of sheer size and ambition Kingmaker. The GM has to put a lot of work into it and the PCs have to be willing to give a lot to it; but for the right group, it becomes a wildly entertaining and epic ride.
In terms of how enjoyable an AP is to run and play in, Skull and Shackles. I've never had a better time as a GM with Pathfinder and my players have never had a better time in Pathfinder than being pirates. The AP went off the rails several times, but never to the detriment to the AP. It's free-wheeling insanity at its best.
As for the best overall story in an AP, I'd give a tie to Reign of Winter and Strange Aeons. Reign of Winter is so gonzo that players knowing nothing works better not knowing just how much the AP goes out of its way to top itself. Strange Aeons has the best opening scene and the best starting dungeon in an AP. The realization that the AP twists back on itself to end right where it begins despite going in some very strange directions is great. The fugue mechanic and overt Lovecraftian elements may turn a lot of players off, but I love it.