I'll have to go to Shibuya for meetings, but the 3 hotels are pretty much mandated by company policies, so like it or not, I have to use them. From the corporate rates, InterCon and Hilton are similar, Park Hyatt is Y10,000 more...

Thanks for the suggestions TransWorldOne, I looked up the forums as you suggested and found a lot of useful information.

I'm personaly leaning towards Hilton - I'm only HH silver so would like to work to Gold. No status with Inter-Con, so prob will only stay there if there is a compelling reason to do so or if the other hotels are sold out.