For my first novel, Hack the Yak, I just started writing, mostly character sketches. Then wove the people together into a plot. Call it the Crash Ahead writing method. I loved writing that first draft, typos and inconsistencies included. I’d just sit down and throw myself at my characters and watch ‘em react. The plot suffered. Stuff happened in Spring that should have happened in Winter. Characters ended up in the wrong place at the wrong time. Subplots wrenched control away from the main plot . But, ahhh, it was fun.
Early in the novel I’m working on now, I joined two writing groups. We’ve had some discussion on the subject. I got fired up about using an outline and began assembling (electronic) index cards to sort out the plot. I just couldn’t get into the outlining business. Too much like work. But I could see that the plot would benefit. So, being a middle-of-the-road, see-both-sides-and-generally-stay-in-the-middle kind of guy, I produced a fairly detailed synopsis, then got back to what I like doing, generally following the synopsis. We’ll see how it goes.