After thinking about it some more, I think the Spurs and the Clips are equally terrible matchups for Houston. With the Clips, Blake and DJ would feast on Josh Smith and Dwight. If the Rockets play the Spurs, Pop would just put Kawhi on Harden for 40 minutes and Houston would be fucked.
I don't like either series, but I guess I'd probably prefer the Spurs. Clippers negate one of Houstons big strengths with a front court of Deandre and Blake. And a healthy CP3 is a nightmare for the Beverly-less PG situation. Just a bad matchup. The only saving grace there is LA's nonexistent bench, whereas the Rox 2nd unit includes Smith and Brewer.
At least with the Spurs Parker isn't 100%, Green and Manu aren't shooting well, they're more likely to struggle with Dwight-Smith-TJones, and they'll be coming off a 7 game. That and their regular season match ups have been a little better than the Clippers series.
But yeah, tough either way.