Mark each meld concealed or revealed, then pick which tile you actually went out on — that determines Edge Wait, Closed Wait, or Single Tile Wait automatically. Most wins are a two-sided wait, which gets no bonus.
Context
Other going-out bonuses
Only one of these can apply to a given win. Self-draw: you drew the final tile in the wall yourself. Off discard: the wall was already empty, and you claimed the very last discard of the game.
All 3 other copies of your winning tile's rank are already visible — in hands, melds, or discards — before you win on the 4th and final one.
Bonus tiles collected (flowers + seasons)
Holding 7 of the 8 bonus tiles is an immediate win at 3 faan; holding all 8 is an immediate win at 8 faan — regardless of your hand tiles. This is separate from the per-hand flower bonuses below.