Since your original question was about type of exterior structure, I'll stick with that.
I think for most it's primarily a personal preference moreso than anything else. Luckily for me, I tend to like the look of siding over flat Filon. Not to say I haven't seen some I liked, I have. But overall, I like the traditional look of siding.
On top of that, it's lighter, cheaper, and is easily repairable. I've read some of the horror stories about delamination and I have no interest in going down that road. I won't dispute it's more aerodynamic, easier to care for, more engery efficient. All in what you like in the end. Chances are high I'll probably own one some day. Best of luck in your decision. Post pics when you decide.
