China:Dancong, anxi style greener oolong, wuyi style oolong
Taiwan: High mountain tea, oriental beauty, roasted tgy, oriental beauty, boazhong
There are many other styles too.
Those are some general styles of oolong that each country is known for. To answer your question you need to try out all those different styles to get a better idea. I don't think you will gleam too much from words. They can overlap, like roasted tgy is made in both countries (though outcome seems rather different). A green anxi tgy can have similarities to boazhong depending on processing.
Taiwanese style high mountain tea (and really any style of tea there is a demand for) can be processed and grown in china (and other countries).
Here is an example of taiwanese style grown in china. http://www.yunnansourcing.com/store/pro ... oduct=1881
Rather strange to compare country to country, after all taiwanese people were chinese not too long ago....maybe best to break it down into style of oolong if you want to compare things (though even then processing can change things so much)