Acoustic Panels (2” or 4”) Thickness?

I already have several pairs of GIK acoustic panels ranging from 4” to 6” thick.  I was unable to use bass traps in my current room, but will need them in my dedicated listening that’s under construction.  So, I read about Acoustic Sciences Corporation (ASC) and decided to buy a pair of their 16” x 3’ IsoThermal Tube Bass Traps.  Visit their website to read about their tube traps and their technology.  They recommended their 2” thick, 6” x 60” Soundplanks for sidewall reflections.  Now, GIK is adamant about using their thickest absorption panels on as many wall spaces as possible.  I was a bit confused why ASC manages room acoustics with tube bass traps and 2” thick panels and GIK prefers the huge acoustic panels?  After reading and talking at length to ASC, I prefered to use the 2” thick Soundplanks with their tube bass traps.  I will use some of my GIK panels on the rear wall and some in my HT setup located in a separate room.

I know it depends on room size, your hifi setup and your desired sound, but I’d like to hear your experience with ASC products vs. GIK or other acoustic treatment manufacturers.

Thanks in advance!