When you do back yourself into a wall, you'd be glad that the selector on the Dual80s can be reversed using a flathead screwdriver; have fun with the flush selector on Matco/GW.
The head thickness is all BS as well. Matco/GW may look thinner, but once you put a socket on the ratchet the difference is night and day. I have noticed that the gap between the faceplate and socket often cause a tilt in the system when you torque on it, and that's how you strip a rusty fastener. This doesn't happen with Dual80s.
The combined height of my Dual80 and SO sockets are thinner than its GW/Matco equivalents.
The Matco/GW flex handle ratchets have wider yoke (where the flex is) than my Dual80s, effectively lowering your swing arc by a big margin.
My 88/120XP have trouble free spinning on its own when a fastener is almost completely backed out, some resistance must be applied to the ratchet/socket in order for the ratchet mechanism to work (you need two hands to make it "work"). This NEVER happens with my Dual80s. The offset pawls on the Dual80 is much better designed against back drag than 88/GW's 6 o'clock position.
The chrome on the Matco/GW turns yellowish over time, my Dual80s don't do that.
I have also noticed that my GW soft grips swell after prolonged exposure to automotive fluids, and good luck trying to find a replacement. My Dual80s cost me $7 to rehandle.
These "features" only looks good on paper. In reality Dual80s have them beat in every category.
Edit: okay, 88/GW is easier to maintain/rebuild. That's about the only thing they have over Dual80s.