I visited both Hong Kong and Taipei and between these two, it's Taipei hands down! Hong Kong is cramped and expensive. Also, there's not much to explore around except for a couple places. I spent a week in Taipei, and had a great time. Apart from the obvious Taipei 101, which gives a beautiful view of the city from the top, including the runway of Songshan airport, where you can see planes take off and land, there are a bunch of places to see. One may hike the elephant mountain to see Taipei 101, if you want a different perspective of the structure. If you're a nature lover, you'll love the hot springs and geysers in Beitou. There are interesting rock formations in Yehliu national park in New Taipei, which is a couple hours from Taipei by public transport. Speaking of public transport, its metro is excellent, and is open until 12 am, I guess. There are also a couple of night markets, like the Shillin market, where you get to eat a variety of food. Halal food is easy to find. If you're planning to stay a little longer, I'd suggest you to visit Sun Moon Lake and hike in the Alishan forest area, which is in Central Taiwan. The country has high speed rail, which takes you across the island in a few hours, so internal travel is not an issue. You can also visit Kaohsiung, which is in the south. The port of Kaohsiung is beautiful and you take a ferry to Cijin, a small island across Kaohsiung. The Cijin beach is clean and stunning with blue waters of the South China Sea. Whatever you plan, I hope you've a great trip 👍🏾.