[shakna]

... Except generators and comprehensions are often faster than for loops in your hot path.

Apart from that... What's readable tends to be the best option.

[swsieber]

I think the Python community considers list comprehension more readable than loops.

And writing generators allows you to write simple code with them. I don't consider generators to be fancy - just a tool to pull out complexity into a small area and make the rest of the code readable.