As a SPG Platinum, I stayed twice each at the Lai-Lai Sheraton and the Westin in the past year or so. On every occasion, both properties upgraded me into better rooms. The Sheraton gave up a suite on both occasions, while the Westin gave me a Guest Ofice. But I do not see so much 'benefits' in terms of room amenities at the Westin, except for a personalized phone number and the Heavenly Bed (which I like a lot). Otherwise, the room was small at the Westin. As a gold member, the Sheraton also upgraded but the room I got was plain and simple.
I've stayed at the Hilton but I was then a non-elite. The room was not good at all.
For transportation, besides taking a cab, there are airport boses for major hotels in Taipei including the above three. You can just inquire after clearing the customs. It's toward the left once you get out of the customs area.
[This message has been edited by Chiangi (edited 09-22-2000).]