[csytan]

Javascript's async feels a bit more natural than Python's.

In Python, you've also got to run the event loop and pass the async function to it. This makes playing with async code in the interpreter more difficult. Also don't forget that async is also turtles all the way up (same as in JS). It'll infect any synchronous code that touches it.

I've written a Tornado app which makes heavy use of asyncio, and while it's pretty efficient, I would reconsider writing it the same way if I had to go back in time.