Fears over Beijing's influence on the island have grown since a rapprochement under the ruling Kuomintang (KMT), culminating in a landmark meeting between current President Ma Ying-jeou and Chinese President Xi Jinping in November.
Public unease over closer relations is a major factor behind the KMT's dwindling popularity and sparked the occupation of parliament by protesters last year over a trade pact with China.
Tsai Ing-wen of the Beijing-sceptic Democratic Progressive Party (DPP), widely tipped to win the presidency in January, criticised the KMT for relying too much on China.
But she trod carefully when it came to political relations with Beijing.
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"Everything can be discussed," she said.
"This is a rational approach and I believe China will also take a rational attitude in interactions with DPP."
Tsai has consistently said she will not rock the boat with China if elected, but has been slammed by the KMT for being unclear on her strategy.
"Tsai said she will not provoke China and there will not be surprises, but she is still being vague," her KMT opponent Eric Chu countered.
"China is not our only option but we should not oppose everything China-related," he said.
Taiwan is self-ruling since a split with the mainland in 1949 after a civil war, but has never formally declared independence. Beijing sees it as a renegade province awaiting reunification.
Beijing insists any new leader must recognise the "1992 consensus" -- a tacit agreement between the KMT and China which says there is "one China" with different interpretations.
The DPP has never recognised the agreement and Tsai remained circumspect Sunday.
"I believe cross-strait relations can remain stable... The 1992 consensus is an option, but it's not the only one," she said.