The only reason to want to play the Rockets, is so that they can be checked off the list of being the only West team Duncan has never played/beaten in a series. Otherwise, in cases like this, where probably only multiple debilitating injuries would prevent the Spurs from relatively easily dispatching of any of the options, I'd always prefer to avoid the team with the highest upside and as big of a disgrace as they are, the Rockets are still that team. They've got the best player of the bunch and probably the most experience too.