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

[1BAD89]

You know, I was paying attention how I come to a stop or when I get ready to turn, and I downshift. But everytime this topic comes up I picture someone going like 65, and throwing it in 2nd to slow down, instead of applyng the brakes. I use both, but I don't abuse it when I shift down.