If you send 3KB responses then you would see both setups are much closer in performance.
Factor in some actual I/O and the difference will be even less. Then you'll eventually realize using either one makes little difference when it comes to performance.
This is why micro benchmarks are pure jokes. A real world site has a mix of response sizes, database I/O and caching. It's the only way to test something properly and you'll see if you properly test both there will be little difference in performance.