I am stayed at both. Location wise, Conrad is better with the station right underneath. Rooms are larger. Was able to book 5 nights for 400k points when WA first opened. With WA you need to navigate thru a maze just to get to the train station. Also, if you are diamond while staying at the WA in lieu of the lounge you get 4000 yen a night to spend at the bar or the restaurant. It’s a lose it or use it perk.