It's not even close.
CP3 is already starting to look like age is catching up with him, and they are stuck paying him ~/$40M per through 2022. As his speed leaves him, he is no longer going to be the same player or defender.
Aldridge's game relies less on his athleticism, and Spurs are "only" paying him ~$25M per over the next three years. Big difference.
Not to mention that the Spurs have young assets. Murray and Walker look like they could be studs. White has a chance to be a good player if he can get it together. Poetl's floor is at least a serviceable big man. Pau's contract is likely gone after this season, and Mills will come off the books soon enough.
The only young player that is worth a damn on the Rockets is Capela, and he's almost making as much as Aldridge to just chase rebounds and catch lobs.
The Rockets sold out their future and went all in on this season to get back to the WCF or better, and they are crashing and burning in spectacular fashion.