Pi Pico _thread vs uasyncio, when to use which?

[sam_python]

Coming from web Python. MicroPython on Pico gives me both _thread (run on core 1) and uasyncio. When to pick which?

What I figured out:

• _thread = dedicated CPU core, hardware parallel, good for hard-real-time tasks (motor PWM at fixed rate)
• uasyncio = cooperative concurrency, good for I/O bound (read sensor + send WiFi + blink LED)

Question: can they mix safely? E.g., main core runs asyncio loop, second core runs threaded motor control. Shared state via mutex?

Untried so far. Anyone done dual-mode on Pico in production?