I've stayed at both these hotels many times and echo the comments here. The Sheraton was a bit of a dive for a while until the renovations. The gym is top shelf and so is the club lounge. The Westin is nice for escaping DT in busy times and enjoying the lake view in the nicer months/days, however the hotels is quite old and feels like an old westin. I have never gotten a suite or anything resembling an upgraded room at Sheraton and find the rooms a tad claustrophobic. The new renovations are nice though and it is well situated in the path for meetings, etc. +1 on parking in the City Hall lot, the valet is a ripoff and madness.