The software stack is a lot less complicated but OTOH the most common hardware (ESP32) has its own vulnerabilities. But, the exploit gear is in all likelihood less commoditized. And in principle you could make a more secure version of the hardware, that would cost more but not crazy amounts more.
Overall ask yourself what you are trying to keep secure, and take a more global view of how private info could possibly escape from where it belongs, rather than starting on specific parts of your network such as the radios.
The software stack is a lot less complicated but OTOH the most common hardware (ESP32) has its own vulnerabilities. But, the exploit gear is in all likelihood less commoditized. And in principle you could make a more secure version of the hardware, that would cost more but not crazy amounts more.
Overall ask yourself what you are trying to keep secure, and take a more global view of how private info could possibly escape from where it belongs, rather than starting on specific parts of your network such as the radios.