I know this is dangerous political territory, but my understanding is that neither would object reunification on their terms, and see themselves as the 'true' China [1]. The same was the case for Germany. Things just became so bad in eastern Germany that the government there accepted unconditional reunification in order to avoid total collapse.
[1] not sure how true this is these days for Taiwan, but it definitely was the case historically.
[1] not sure how true this is these days for Taiwan, but it definitely was the case historically.