First, if I could choose my guide, it would be Lori for sure! She was knowledgeable, personable, and funny. She not only interacted with the guests aboard, but acknowledged and had fun with people on shore, on bridges, and on other boats. We were part of a very friendly group of passengers, so we all got in on it.
Lori made the tour so interesting and provided so many facts about the buildings and parks along the way, it was a blessing. We went to Skydeck the morning after our tour and were able to identify many highlights that Lori pointed out along the way from our 103 storey vantagepoint. Lori's guidance made our other Chicago exploits much more rich and immersible.
I would recommend Wendella over the other river tours.