On the Floor: Sections Floor 1, Floor 2, Floor 3 and Floor 4 are a part of Floor Seating, which offer some of the closest views of the performers. For many concerts, floor sections are added or removed. These performer-specific adjustments may alter the floor layout and the views from each floor section.
To the Side of the Stage: For close views of the stage with a little bit of elevation, consider seats to the side of the stage in 101, 102, 110 and 111. The view is not head-on like on the floor, but many of the seats are closer to the stage, provide better elevation and are actual stadium seats.
Head-on to the Stage: Seats directly across from the stage, like those in 105, 106, 107 and 207 provide the most comfortable looks of the performance. Even upper level sections offer unobstructed sitelines. Just keep in mind that you won't be able to see as much detail from these seats as you would if you sat closer to the stage.
Consider the Following When Buying Tickets
If you're on the shorter side (or bringing kids), consider floor seats only in the first few rows: The most common complaint amongst floor ticketholders is that they can't see the stage because of taller people in front of them. As an alternative, consider side sections near the stage that will still have you close and high enough to see.
Lower level side sections are not created equal: While the side sections closest to the stage are top-notch, side sections farther from the stage may leave you with a cramp in your neck. Sections 102 and 110 are not well-angled towards the stage - leaving you to turn your head for an ideal view. Instead, consider head-on sections in the lower level or even close side seats in the upper level like Sections 220 and 219.
"The acoustics for a concert are not the best." - I prefer Allstate, Ravinia or Rosemont for live music in Chicago.
"Lots of Fold-up Seating in Sections 104-108" - A lot of the seats in Sections 104-108 are temporary seats that they bring in for hockey and concerts. Seats are cheaper and not as comfortable as permanent seating, but the legroom seems slightly better. Rows 12 and below (including lettered rows) are temporary.
"Glass Gets in Way of Row 1 in 200 Level Corners" - If you're sitting in 203-205 or 213-215, skip the first row. The glass partition gets in the way more for these seats than in many others. Save a couple bucks by going up a couple rows and not having to try and look over or through the glass barrier.