If you're using Python, I would consider pure asyncio + worker processes ...
asyncio gives you the "straight-line" style of code like Go, and good timeout support, which is necessary for robustness
asyncio.Queue gives you backpressure, just like Go
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That's for using one core, and then if you need to use all cores, use separate processes. (Threads won't utilize all your cores)
And maybe hand-roll the worker processes the the async child process - I think anything that automagically uses the "pickle" module is bad ...
This way you're using 1 or 2 concurrency models, not 3!
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I think Go is probably more foolproof because you don't have to make as many of these choices. (It multiplexes goroutines across OS threads, etc.) But there are still reasons to use Python, e.g. if you application revolves around C bindings to some important service, or you just like using Python
And Python's type system is actually more expressive than Go now ...
