After big MLB trades, people immediately ask which team won.
The reality is that it's difficult to determine a winner right away. If the central figure in the deal helped his new team make the postseason, then you could say that team won the trade. But maybe the other team got a gem of a prospect who becomes a huge factor years later. It's possible for both teams to win the trade.
Regardless, it's fun to look back at blockbusters and see how they worked out for each team, especially recent trades since many of the key figures are still playing.