What's Best? Downshifting or coasting in neutral and using brakes?

[PKRWUD]

Downshifting. It's called Compression Braking, and it's healthier all the way around. Engines hate idling more than anything else, and brakes will quickly glaze if you regularly apply them for more than a few seconds at a time. Other benefits include much quicker throttle response if you should unexpectedly need it, and less carbon build-up in the combustion chambers.

Take care,
-Chris