Mashing vs. Timing?

[Yashichidsf]

There are several tricks that can be done either by mashing or by timing, and I generally find myself mashing, but I'd like to know what other people do and their usual success rate in doing it. The tricks I'm talking about in specific are rolling, WW diving into dry storage, and ledge clipping into pulling out a leaf. Also, I've heard that timing your rolls is faster than mashing, is this because of some mechanic that purposefully forces you to wait a few frames more before Link rolls while mashing, or is it just generally the idea of "getting the feel for it?"