Because none of them has come up with a good defense of their policies. The day a single one of them does, all of them start spouting the exact same thing
From the perspective of the global citizen, arguably the USA would present more unilateral risk. The USA wouldn’t hesitate to act in their own interests in a way that screws others over. Then again, China has even less scruples, so it’s a lose/lose situation here.
Plus I have nonzero but small legal rights and remedies to mitigate my own country's surveillance of me.