Taiwan has some terrible cities, except Taipei. It's where the KMT spent most of the money. If one ventures to other cities like Taichung, one has to walk between cars as sidewalks are impassible due to parked scooters, step over dogs, and take in the constant change of stench from street food vendors or completely polluted streams.
When started my cycling tour of Southern China after having lived in Taiwan I prepared myself for the worst, considering that Taiwan was a much is much wealthier society. I was pleasantly surprised how good Chinese cities were, bicycle paths everywhere, wide sidewalks, large shopping boulevards, massive squares, historical sights, etc. My cycling journey ended in Bangkok. Even though we arrived by bus in Bangkok at 6am to avoid heavy traffic, by 7 am I thought that this was the day we're going to die. Lived in Bangkok for a year and enjoyed all it's services, but in the end, I must confess I would've rather spent time in Kunming than there. Bangkok will choke you. Roadside pollution is terrible as highways and BTS cover the roads, thereby trapping pollution, there's very little green space, traffic is terrible to the point where you wondered why you took a taxi, rather than just walk there. Nonetheless, it's a great place to get out on the weekend, to be spent on a tropical island.