You mean the secret court, with secret rulings, where only the government's case is heard, and 99.9% of requests are granted?
Most criminal indictments are also end in the state's favor, but that doesn't mean the jury system is rigged, it means that prosecutors don't bring cases that they are likely to lose. Similarly, the FBI doesn't apply for a FISA warrant unless they are certain its well warranted and the court's decision will be easy.
A warrant is a warrant. An expression of the governments investigative powers.
The police aren't required to inform you and give you a chance to argue your case in court for why thy shouldn't raid your house for the drugs they're pretty sure you have.
Cops don't need your written permission to point speed radar at your car.
In America they spy on dissidents too. It's just a matter of calling them terrorists.
https://www.aclu.org/blog/national-security/privacy-and-surv...
It'd be a real court if there were a sort of public defender, and the judges simply mediated between both sides. You could see it working in the warrants rejected.
In fact the court is adversarial, though not like you seem to be envisioning. There are many courts in the US, in fact most where no litigation happens because it's inappropriate for the task. So the idea that they are playing "both sides" is a non sequitur.
The role of the court is to ensure that requests are legal and there is sufficient evidence to pursue the task as requested. It's exactly the same as when a judge issues a warrant.
And even within the US, FISA warrants are only applicable to data collected which is intended to be presented in court. The CIA and NSA have no mandate whatsoever to gather data suitable for presentation in court, and investigatory agencies such as the FBI/DEA/ATF, which do have such a mandate, have lots of ways to launder evidence. In practice, FISA warrants are often issued long after the data has already been collected, and the FISA warrant is only requested as a means of laundering the evidence via one of the exceptions to fruit of the poisonous tree (parallel construction, inevitable discovery, or the good faith exception).
As it applies to this situation, I don't see any reason to believe the US is any less likely to spy on anyone than China. If you don't have the means to produce needed technologies yourself, then I'd choose the US or Chinese manufacturers based on other factors, such as cost, or which nation has incentives to use the data they collect against you.
I only got my girlfriend a little pregnant; not like Joe over there, who got his girlfriend fully pregnant.
See I can name meaningless aphorisms too.