Suspension bridges tend to be much prettier than other styles. I think this every time I get to cross the Tacoma Narrows.
I'm assuming that is just a preference of mine based on how much rarer they are to see? Could be that they tend to be more expensive and have the maintenance baked into the costs?
Good examples in the article of how to make others pretty. I'm assuming cost is almost always the limiting factor. Many "ugly" bridges have a hard time keeping up with required maintenance. Keeping any art clean and maintained is almost certainly not in the budget.