Depending on how late really late is, my vote would be for the Hyatt. Some of the economy hotels discontinue their shuttles after a certain hour (11 or midnight) and you may end up with a very costly taxi ride if you don't make it.
Check around for low rates at the Hyatt. Aside from their own website, I've seen them listed on hotels.com, hoteldiscount.com, expedia.com. Also, you can check out flyertalk.com for interesting information about bonus codes, etc... Just go to the Hyatt's (or any hotel's) forum.