Planning Stories Vs Winging It

What kind of writer are you?

Do you plan everything about your story to the last detail? Character bios that cover every detail of their lives? Plans that include all minor details of the plot like every subplot, conflict, argument, downfalls, outfits worn, weather, strangers they pass in the street, what pants they wear?

Or do you wing it, and have the major scenes in mind and you set on your merry way and bash at your laptop until you have 50,000 words, hoping everything fits together nicely and letting your characters decide what happens next..?