I am going to a wedding in Chicago in May that is taking place at the Inter-Continental hotel there, but want to stay at a Starwood Property since I am a Preferred Plus member. Does anybody have any opinions on the differences between the following four? Thanks.

Sheraton Chicago Hotel and Towers
301 East North Water Street

The Westin Chicago River North
320 N. Dearborn Ave

W Chicago Lakeshore
644 North Lake Shore Drive

The Westin Michigan Avenue Chicago
909 N. Michigan Ave.