I've never had the opportunity to compare various seats in the Lower Balcony. Any place I've been sounded very good. I think the critics generally had seats a few rows up. Some critics have complained about "dry" acoustics quite frequently.The front Lower Balcony at Chicago is simply terrific as you know. The clarity and impact of the double bass and lower brass is just wonderful.
What I like most about the LB is the visual aspect with close proximity to the stage. This is probably a function of the site -- relatively wide, but not very deep (especially before the acquisition of the alley behind the stage.) Balconies in most "shoe-box" halls start many rows further back.
I like the Gallery for a variety of reasons.The price for a 5 concert Thursdays package is $175 versus $720 for the front of the LB. Or $1,050 vs $4,320 for my 30 Thursday nights. The LB experience is better but not 4x better. My 10x monocular helps quite a bit when needed - say to watch piano players.
A virtue of my 9th row seats is that there are NO stair steps at all. Just take the elevator to 6 and walk to the seats. A quick exit to Adams Street via the Rotunda elevator.
I'll be hearing Danill Trifonov playing Rachmaninov Piano Concerto No. 3 in a couple hours.
Ron