Hi you are posting in similar threads so we're somewhat repeating ourselves.
You just proved a point about the context is everything. All charging technologies converge to being slower as the phone gets nearer to fully charged. If you had benchmarked say 0%-50% you'd likely see a much bigger difference between QC and non-QC ports.
non-QC is about 10W. QC is usually about 18W but a phone drastically reduces its Wattage from about 85%. So you probably spent about half your time at the same Wattage from probably 70% charged.
Go try: 0%-50%. You'd probably find QC about twice the speed of non-QC.
Go try: 70%-100%. You'd probably find them identical.
This is an example from another phone. From 50% charge to 100% charge took 108 mins, vs 0% to 50% charge 42 mins. Observe the Wattage drops dramatically from around 80% charge.