By Canadian standards, our winters are spring time?

I think I would rather have a lip from the fiberglass for the paint. I just don't have faith that the paint will survive more then a few years over those welded joints without cracking. The paint, not the welds.
Since I'm not going the flare route, I don't really need to decide anything except that the fiberglass would have to be a very serious consideration for me.
Best of luck for all.