If its just in the playoffs then the Giants are clearly the best.
That's said with hindsight though. The playoffs tell just as much of a story as the regular season does and it was my opinion that from the start of game 1 to the 10th inning in game 3 the Reds were the best team out of all others in the playoffs. Things can change slowly or quickly, just how the outcome of a series can be told through one play or through 7 games. For example, the Rangers had the best offense in baseball but after one game it didn't matter. The Braves had a much better team top to bottom than the Cardinals but essentially one (among a few) play(s) sent them home. The Giants were an inferior team to the Reds and Cardinals but 6 elimination games later they're WS Champs.