I greatly prefer scripting...as much as I like to draw, I'm just too lazy to enjoy the work of drawing a comic. There's a reason my gallery is filled with static character designs...
Although I find it at once puzzling and mystifying that people can go without scripting entirely. '_' I mean, if you have a slice-of-life comic, it's probably not a big deal, but if you have your average drama comic that takes a year or two just to get rolling, I don't know how you can manage that without a little planning.
Generally, I find it easier to work with lines I've written in advance (Ctrl+F is your best friend~) than to retroactively keep track of every little random thing I've had the characters say in the past...either you'd have to know your story and characters really well, or simply not care about the inconsistencies that are bound to crop up...