I am booking a stay in Chicago for the upcoming weekend (Jun 21-25) and am trying to decide between the two W's and two Westin's (W Lakshore, W City Center, Westin River north and Westin Michigan Ave). It's for a vacation with my girlfriend and I will be using my suite night upgrades. Any thoughts on which property to stay at? Which place has the best suite night upgrades?

Thanks in advance.