Taipei has a much better quality of life than Bangkok (actually good public transportation!) and is surprisingly affordable too.
For instance, when I was last there a year ago, a friend talked to me about his apartment and how expensive it supposedly was. IIRC, it was a two-bedroom condo right in the center of the business district. The price was 16,000 NTD and at the time NTD and THB exchanged 1 for 1, so it seemed to me that Taipei was actually one of the few Asian capitals where rent could be cheaper than here (to be verified).
However, every foreigner I know who lives in Taiwan said that while getting a visa for a few years is relatively easy, living there long term is much more difficult.