I would argue that iOS is more dangerous because we can be fairly certain that it's not only vulnerable to exploits like Pegasus, but also phones home to FIVE EYES on a regular basis. Qubes is vulnerable to neither of these attacks, and it's architecture is explicitly designed to isolate all components of the system with hardened hypervisor technology used by the most high-security servers in the world. For the most part, you don't even have to trust the device you're running Qubes on; the isolation technology is that robust.