I write what I feel expressing the emotion accordingly. My editing mainly centers on spell check and simple recommendations that my word processor suggests. I try to leave the fine tuning of proper syntax and structure of the sentencing to the professionals.
I find editing to be a chore, I'm more for imagining worlds and such.
I think editing is more important that the actual writing. I don't know of any professional who doesn't edit their work half a dozen times over before sending it out. But everybody has a different formula to doing it - some are more systematic than others. In terms of style, I think part of solidifying your style is through the editing process, and you might surprise yourself with things that you pick up on that you didn't notice before :) One of my favorite quotes that speaks to this is, "Writers don't like to write. They like to rewrite what they've already written." I can't remember who said it, but it's something to that effect.
Personally, I love editing -- but I prefer editing others' work over my own. I find it difficult to edit my own work, at least not before I've had someone else look at it and let me know the biggest/most glaring issues. Starting that second draft is always so difficult -- what do you leave out and keep in? On the other hand, there's nothing like the feeling you get after you complete a second draft! It really feels like an accomplishment.
I love editing, though I often find I don't edit my own work as much because I'm too close to it. I do copyedits on my own work obviously, but I always need to send work to a friend or two before I can fix things on my own work. I also think editing is what sets it apart from being a hobby from more of a career. It's often said that anyone can write (which I don't think is wholly true but that's another topic) but it takes some level of education in the matter to be able to polish a piece and edit in a way that goes beyond "Oh, I think it's good. I like it."
I love editing ahha, it's my favorite part actually because you usually have taken time away from the piece and can see it more for what it is. And then, when you're disappointed, you get it fix it. It can be really frustrating when you know there's a problem but don't know what to do about it, but usually if you spend enough time with something you can figure it out. And it's absurdly satisfying when you do! I prefer to edit my own stuff, as I can be ruthless with it, but working with somebody else is really interesting and I usually learn a lot from talking through their pieces and their thought process behind them.
I used to be great at editing, or SO I THOUGHT. Once I walked through the doors of a college-grade English tutor, my paper was torn to shreds by a young tutor armed with an English major. As for personally editing my own stories, I see each mistake in the writing as a puzzle waiting to be figured out, so that every reader can better understand the story.
I've grown to love editing. As a writer, I still hate that I can't get it right on the first draft. However, I love to edit other people's stories, to show them all the possibilities that exist with their narratives.