As a pax, I have learnt from flight crew that Airbus wings were designed for fuel economy. They go slower but are smoother and, for the distance, the amount of fuel saved is significant.
On a short or medium haul, the time diff for an Airbus wing is negligible. On the long haul, it becomes noticeable but not significant. For example. LHR ~ JNB: This non-stop sector of (avergae) some 10.5 hours, is shown with 30 minutes extra for the A340 against a B747. I gather that the time is less than that but 30 mins is easier on the schedule for pax to understand.
So, from a pax point of view, it's irrelevant. From the human point of view, when I hear people boasting that their toy goes X knots faster than another, I think: Bunch of babies.
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"I tell you, we are here on Earth to fart around, and don't let anybody tell you any different." Kurt Vonnegut, Jr.