Is it that way with all KGSS vs KGBH or just the ones that you built? I know my KGSS is brighter than my KGBH, but I'm not sure I would describe it as better rather than just different. The KGBH is definitely a little more refined sounding, and not as forward and aggressive, with noticeably stronger bass.
I was only going to keep the KGSS for a "short while" and ended up still having it a year later.