I would say that what you say, if anything, depends on the particular trick or routine - and your personality.
Good advice in magic, and in life in general: Be yourself.
Explanatory patter, such, as "Now I m going to..." or "All I have to do is wave my hand like this..." is not entertaining, and may insult the intelligence of the spectator. Most often it is outright boring.
Stories may go very well with some tricks, and people like stories if they are interesting, intriguing or funny and fit what you are doing. But if you're going to tell a story, make it a short story, not a novel. And sometimes it might be preferable to be straightforward and mysterious, or say little or nothing. Whatever your patter or story is, it should not be long and drawn out. (Think about those people who draw out a joke or recount a story that seems like it goes on forever until you are practically praying for it to end.)
For me, a lot of the fun in magic is the creativity. Experiment with different scripts and patter, and you may end up changing or improving how you present something. The reactions of your audience are the best guide to telling you what works. I like to involve the people and make them the center of attention. After all, in any performance art, it's about them.