Am currently booked at the Andaz Gangnam for 2 nights, but also considering the Grand Hyatt since both are 20,000 points per night. Not considering the Park Hyatt at 25,000 points per night. Will be using a TSU for a suite if possible.

Would appreciate advices on whether I should stay at the Andaz or move over to the Grand Hyatt which is on the other side of the river and closer to Seoul Station since we will also be taking a short trip to Busan on the Bullet Train.

I would also appreciate advices on getting to either hotel from Incheon Airport as Uber is not really a good option in Seoul (or so I was told). I know that there is an express train from Incheon to Seoul Station and then I could take a taxi? How much would the taxi cost?